I don't know if this will help, Ive never used imagestation before but the FAQ on their site had this info...
How do I delete images from my album?
To delete images from your album:
1._
Sign in at
www.imagestation.com.
2._
You are taken to your MY ImageStation page.
3._
Open the album you want to edit.
4._
Click EDIT Album: Images.
5._
To delete an image, click the trashcan icon below the image.
6._
An 'X' will appear over what was your image.
7._
Click Save Changes when you are done to return to the album.
the link to that info can be found here:
http://www.imagestation.com/help/faq.html#9
hopefully that helps!