Unable to access some apps installed on my iPad because no icon shows up on the iPad for these apps

Install the Kindle app from Apple's App Store on your iPad.
To do this, click on the App Store icon, click, the search icon (magnifying glass) in the lower right corner, type Kindle in the search box, then select Kindle App for iPad ... or ... Kindle for iPad from the list. Click the Install button.

Once the app is installed, open it.
The files that you already own should start to automatically download. You may only see the various cloud file icons in your list, and then need to click on them to start to download the files.

Updates to downloaded files can be done when they become available or may happen automatically depending on your iPad's settings.

On your iPad, open the App Store by tapping its icon.
in the search box at the top, type Alexa.
from the list provided, click the Open button next to the icon for Amazon Alexa, and follow any instructions that may follow. The icon should appear on you iPad, most likely on the last screen of icons (assuming the you have more than one screen of icons). Sweep to the left until you get to the last screen of icons to see it. Then click on the icon to open the app.

Go into your settings under general, there you should be able to reactivate the apps and icons that came with the tablet. If there are purchased apps go into App Store and retrieve them from the cloud

Hi Julie
If by larger screen, you mean Zoomed screen, it could be that you have turned on zoom in Settings / Accessability.
Also.... the iPad is "booted up" all the time. Generally all you are doing is Waking the iPad from sleep or screen in sleep mode.
To ReBoot your iPad (worth doing every month or so) First quit all Apps by double clicking round button and individually swipe each open App upward to shut the App down. When all apps are turned off, Hold the Top button & Round Button in together for about 5-10 seconds. This will shut the iPad down completely. When all off, Press the top button in for about 5 seconds. You will see the Apple logo while it ReBoots. This usually fixes any minor glitches etc in the Apps. If a particular App is giving problems, you can hold your finger down on it till the X shows in the LH Top of its icon. Click this and it will be wiped off your iPad. Then re download it for free through the App Store and check to see if problem has gone.

Hope this proves useful.
OJ

it is one of the most basic things to know for iPad owners:
icons (or Apps) will be deleted if you press for some seconds on it and after it shakes you may delete it in pressing on
What needs to be done to remove an iPad application:

1. hold on to the icon that you wish to uninstall.
2. After some seconds continous pressing, the App icons will begin to shake.
3. Then tap the close button which will be denoted by 'X' symbol on the top left corner on one of the icons you wish to delete
4. You will be prompted whether to delete the application.
5. You will have to click on the delete button.
6. If you wish to re-install the application later again, you will have to go to the App Store and then download again.

How to Delete Web Page Links on the iPad

It is one of the most basic things to know for iPad owners:
icons (or Apps) will be deleted if you press for some seconds on it and after it shakes you may delete it in pressing on
What needs to be done to remove an iPad application:

1. hold on to the icon that you wish to uninstall.
2. After some seconds of continous pressing, the App icons will begin to shake!
3. Then tap the close button which will be denoted by 'X' symbol on the top left corner on one of the icons you wish to delete
4. You will be prompted whether to delete the application.
5. You will have to click on the delete button.
6. If you wish to re-install the application later again, you will have to go to the App Store and then download again.

How to Delete Web Page Links on the iPad

probably it helps to update your system to the newest
iOS 8.1.2
- there might be a compability conflict between the app and iOS version....

How to Install iOS 8 1 2 On iPhone iPad and iPod Touch

To remove/delete an app from your iPad, do the following:

1. Press the icon for the app until all icons start to wiggle. Note, press and hold your finger down, don't just tap it.
2. When the icons start to wiggle, a small X will appear in the top-left corner of all app icons. Tap the X and you will get see a prompt asking you to verify that you want to delete the app.
3. Click "Delete" and the app will be removed.

Note: The deleted app will remain in your purchase history in the event that you ever want to re-install it.

I believe that you may have the accessibility mode turned on. I think if you double tap with three fingers it should return to normal.