I don't see anything in your Gallery at all Blanche. Did you figure it out?
Normally, you would edit your image, and just underneath and to the right of it, you will see "Delete" with a radio button. You would click the radio button and click Submit and that would delete the image.
Blanche, open the image you want to delete. Below the image on the right click on Edit Image. When you do that you have the area where you wrote your description etc. Just to the right of the image there are radio button choices for what type of image it is. At the bottom of the list is the button to delete. Choose that, SAVE, and poof! all gone.