My pad says the internal storage is almost used up...I inserted an sd card, but not sure how to get the tablet to read it so that I'm able to install more apps and games.

It sounds like the tablet is having trouble reading your 128 GB SD cards.
There are a few things you can try to troubleshoot this issue:

1. Check the SD card for any visible damage. If the card is physically damaged, it may not work correctly.
2. Make sure that the SD card is properly inserted into the SD card slot on the tablet. It should fit snugly and be fully inserted.
3. Check that the SD card is compatible with your tablet. Some tablets can only support SD cards up to a certain capacity or with a certain type of file system.
4. If the SD card was working fine before and has suddenly stopped working, it's possible that the card has become corrupt. In this case, you may need to format the card to fix the issue.
5. If none of these steps help, you may need to try a different SD card to see if the issue is with the tablet or the SD card.

If it's an android, you can change it within an app - like camera. Go into settings and change default storage location from internal storage to sd card.

If the app can't see your sd card, make sure it's "mounted" within your device. Depending on the software version: Go to settings, general, phone/tablet management, storage, from here you should be able to see the sd card. It is either ejected or mounted. Click on the sd card, if you can see the folders content, then it is installed correctly.

Also, if it was used in another device, it may need to be formatted to be used in your tablet. You can do that from the same setting menu.

Hope this helps.

Unfortunately, most apps will not load onto an SD card. You'll find that some apps will, if a card is installed, place data there. Mostly the SD Cards are installed for use in storing photos and videos taken by the user with the tablet camera. Newer tablets and smartphones are coming with more and more internal RAM to alleviate the "full" issue, but in most cases, you wither have to give up the new app, or remove one to get another.

OK, to accomplish this you need 2 hings:
1. A micro sd card. (Which I gather you already have one)
2. File manager installed in your tablet.

Now, if the tablet support micro sd card, you are all set. Download the file manager, it could be Astro, ES File Explorer, etc...
Once installed, open the file manager. The tablet storage, which is known as internal storage, it is display as sdcard/storage (or sometimes as internal storage). Once you tap the internal storage, everything that is installed in your tablet will be display; (Android, DCIM, etc...) Now you need to look where are the pictures or films saved at. It is usually DCIM/Camera. Once you have found the pictures that you want to move or copy, long tap the films, depending on the file manager app, you must tap copy or move (NOTE: Since every file manager is different, some takes a little bit of extra steps, others requires for you to open a menu). Once you had chose to copy or to move it, look for the external sd card location, which will also be located at sd card/storage/ (32gb external storage) and choose this location to paste your films or pictures.
Another way is by using a computer. Make sure that you have all the drivers needed for the computer to recognize your tablet, you also need the usb charge cable. Once the computer recognize it when the tablet is plug in to the computer, open it by double clicking, there should be 2 storage display under the tablet folder: Internal storage and 32gb. external storage. Open the internal storage, look for where the films are saved (just like I explained with the file manager), choose the films that are to be move or copy, and jus drag and drop or press ctrl and C to copy, go to the external storage, open it and press ctrl and V to paste.

touch the "Settings" icon, go down to the "Device" area, touch the "Storage" icon : go to the bottom of the screen, and select "Transfer data to SD card", then select the items you want to move.

You should also move some apps from internal storage to the SD card : "Settings", "Device", and touch "Applications" : then touch each and every application : for most of them, the button "Move to SD card" will be active, just proceed.

Check to be sure the particular SD card is compatible.

There are 2 storage in just about every smartphone or tablet. There is an internal storage, usually about 1gb. or 2gb. And there an internal SD storage, which is not same as the external micro sd card. RAM stands for Read Access Memory, it will not work as storage. Now, when you download an app it is usually save in the internal storage. If you move an app without an external micro sd card inserted, you are moving them to the internal SD storage. If possible got to setting>storage and check how is the storage divided, if you insert the external micro sd card it should display 3 separate bars. Also, another way to move apps and other things around is by using ES File Explorer. Check that out first and I hope you do resolve the problem, best of luck.

Look in Settings/Storage/SD Card and see if you have a Mount option when you insert the card. Make sure the card has gone all the way into the slot and has clicked into place. Make sure the size of the SD card you are inserting is supported by your tablet. (Check the specs in the full manual) If the SD card is larger than what is supported, it may not register with the operating system. Try formatting the SD card on a PC with a card reader and then inserting it into your tablet. (Use FAT32 format).Try another formatted SD card and see if it is recognized by the tablet.

Most apps do not natively install to an SD card when downloaded from the play store. You have to have an app like AppManager, that has a function to 'move' apps from internal storage to an SD card, or use a manual option in the Android Settings section to move each app individually.. If you are that tight on space that you cannot load any new app, you may have to delete or move something from your internal storage so you can download AppManager or some similar app, and then move as many apps as you can to your SD card. If you have a lot of photos and music you can try moving that to the SD card if your player/viewer software will allow you to find it there. Best way to move bulk items (music/photos, not apps) is to connect to a PC through USB, which brings up your internal storage and the SD card as external USB storage items. Then copy from internal storage to SD card through your PC. Best to establish folders on the SD card to hold these items and then tell your app where they are.

Tablets have internal storage and external SD cards (optional) storage. Apps will download to the internal storage. So under Settings > Storage make sure you have space on your internal storage.