Deleting pictures from my phone's photo albums

Just open gallery, find "select" , do it then use the same 'button' to bring up a list of options. 'Delete' should be there.

I've found a related guide for you. Hope it works.
How to Erase Photos from iPhone with iOS 8

Facebook includes a photo album creation feature that allows you to upload pictures to your profile to share with friends.
The option lets you to transfer multiple photos simultaneously to Facebook's website.
Conversely, Facebook also allows you to delete several photos at once using the album editing feature.
Those not acclimated to the process, however, can have trouble clearing photos since some of Facebook's photo album-editing links are small and difficult to spot.
Locate the proper links to find your album's customization page.
Visit Facebook's home page and log into your account.
Click "Profile" at the top-right corner of the page to view your profile.
Click the "Photos" link below your profile picture on the left side of the page.
Click the album for which you want to delete multiple photos.
The album's photos appear.

Click the "Edit Album" link above the photos.
A dialog box appears with basic options.
Click the "Edit Photos" link at the bottom-left corner of the dialog box.
The album-editing page appears.
You can also click the "Delete Album" option on the bottom of the dialog box to delete every photo in the album.
Click the "Delete This Photo" box beneath each photo you want to delete.
Click "Save Changes" at the bottom of the album-editing page to delete the selected photos.
Delete Photo Albums in Facebook

When you upload photos to Facebook, they get stored in photo albums.
The Wall and Mobile albums exist by default, while other albums are user-created.
You can delete entire albums at once to save time.
Once you've deleted an album, though, there is no way to recover it or the photos it contained.
If you change your mind, you will have to upload your photos again.
Log in to Facebook.
Click on the "Profile" tab or picture of you in the upper-right corner of the page.
Click on the "Photos" link on your timeline page.
Click on the photo album that you wish to delete.
Click the "Edit Album" link.
Click the "Delete Album" link at the bottom of the album properties box.
Click the "Delete Album" button in the box that pops up.

Hi all,

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Best Luck
Regards
Mchoff Didoza

go to photos and tap the album in the cammra roll press the arrow and you can now select pics to delete them..
you can delete the pics not in cammera roll by pluging your iphone to itunes then go to settings on your phone to unsync the folder with the pics or deseclect photos if theres buttons aviable .. also set a new folder for your pics if you have photos you want to keep to make that simple

To delete one of your facebook photos that you've already uploaded, simply go into your photos (the link is under your profile picture on your page) and click the album. Then find the picture you want to delete, click it, and underneath the picture should be the option to 'Delete this photo'. Clicking that will get rid of the picture.

Deleting pictures from album are quite simple. Simply locate the file manager on your unit. Once you locate this find where the particular image is saved often depends on how the picture got to your device in the first place pictures captured by the device camera it shoud be under camera pictures or DCIM but if received via bluetooth or downloaded from the internet should be under images.
Once the file is located select options and delete.
Hope this solution has been helpful?

Click on The profile link on the top right of your Facebook page. Once on your profile page click on the Photos tab in the top center column. Select the album containing the picture you want to delete, click on the album's picture. Then click on the Edit Photos link on top of the photos. A listing of the pictures will appear. On the right side, right under the photo there is a delete check box. Click on as many as needed and then at the bottom click on the button: save changes.
Also check if you have have been tagged in these photos, this might be why they have appeared in your album. You can untagged them.
Hoe that helps!

Here's a little more detail... connect the camera to your computer; turn your camera on; switch cable connection to "camera"; in the pop up box select "Copy pix to a ... using Micro Scan & Camera Wizard" and press "OK"; in the next box select "advance users only"; Double click the "DCIM" file; double click the next file; and if you want all the pix gone select the first photo press "Shift" then select the last photo; right click either photo; then press delete. All gone.... Hope this helps.

to delete photos go into menu organizer file manager camera album then click on the picture and delete