Yes you can delete photo's from the gallery.
- You of course must be logged in.
- Click on the Gallery tab at the top of the page.(Home, Forums, What's New, Gallery, Resources, Members)
- From the gallery page, click on "Your Content
-Double click the photo you want to delete
- There should be an info box that has Delete as a choice.
- Select Delete.
My guess it sometimes takes a bit for the website to update your deletetion.