Templar, I think you have to request a gallery first, AdamL you already have one.
Once that is approved, go to the gallery.
Click on your region.
Click on your gallery.
You will then have to login (in blue writing in top right hand corner of screen)
Once you have logged in you will see options on the left hand side of the screen.
Select "add items" to add new pic.
Hope this helps.
I just added this one to test it and it worked OK.