You should be able to click on the photo you want to delete (or edit). On the far right will be an "image tools" tab. click on it and a drop down menu will appear giving you an option of things to do...one of which is "edit image". Click that and a new window will pop up with "delete image" as an option.
From there though, you can change the "category" it is posted in...so you won't have to delete it & reload it, you can just move it.
You can also click on the "my stuff" tab, which will allow you to set up your albums.
Hopefully this helps...