I don't think you can Dave. It's probably a job for Admin.
T.x

You can only do this for pictures you have uploaded.
Click on the picture to view it full size. At the top of the picture is an edit button (camera with pen), click on this to edit your picture. On this edit picture page there is an option below the picture to click in a box to remove your picture. Click there and save. Your picture will then be removed.

Ha! I stand corrected!😀

I did not get that quite right. Just click on delete rather than save to remove the entry.

Thanks, now dealt with