Let's practice deleting a gallery first.  As before, after clicking "Photo Galleries" under "NHF Community," and then "Photo Galleries," click "User System" at the bottom.  Follow that by clicking the drawer icon at the top.

Since I want to delete the gallery previously created, "Practice Gallery 1," I'll check the box to the left of that title.  I'll then click the trashcan in the upper righthand corner.  A popup will present itself, with the text "This option will remove a gallery completely, including media!"  As the box says, be careful not to remove galleries which other people would want to visit.  I'll click "Ok," after which the gallery and all the photos in it, will disappear.

To remove a photo, you need to click a red 'X' in the upper corner when you browse through a photo gallery. 

If you don't see the 'X,' as in the below screenshot, you need to email This e-mail address is being protected from spam bots, you need JavaScript enabled to view it to request the ability to delete photos, or ask that a particular photo be removed. 

 (Obligatory screenshot)

After you receive email confirmation that this has been done, the next time you login you'll see the small red X above each photo.  Clicking it will immediately delete the photo.