hi global ranger,
agree - it does seem to be really well hidden. Perhaps the powers that be can make it a bit more easy to find.
Basically i think the system automatically creates an gallery for you once you register.
Then the way i did it was to go to my gallery and down on the right hand side there was a box with the option to add a picture. from there it's a bit more straight forward.
i took the liberty of finding your gallery and it is here ... http://www.flightglobal.com/AirSpace/photos/global_ranger/default.aspx
Best of luck!