Hi Jack,
You won't be able to upload photos into the galleries unless you are a subscriber. You can read about the subscription there: (there was a url link here which no longer exists)
The subscriber status gives you access to the social groups, the galleries to view other users' photographs, and you can post your own photographs in your gallery.
Uploading the photographs is very straightforward.
When you are not sure where to post, you can have a quick browse at the list of the forums there: (there was a url link here which no longer exists)
I personally would have posted this question in the feedback/discussion forum there : (there was a url link here which no longer exists)
I hope this helps.
Delphine