Go to the profile. See tab that says images. Click. Choose image you want to edit. See a line above pic ? An example from my stuff. See line with image number ?
https://www.wikitree.com/genealogy/Corner-Photos-501
Click on that. You get something like
https://www.wikitree.com/photo/jpg/Corner-501
Arrow down on left side, see remove from image. Check the blank circle, arrow down to save changes
