oh why of course., this is where i can help ^_^
underthe ADs you'll see sub headings ike "My Photos" "my favourites" etc.,
on the right side of those are "upload photos"., this is the one you want to click on first
you then select which category you think your pic willl fit in., i.e, if you are posting a wallpaper., it goes into the "wallpapers" galeery iether in the anime,gaming,misc sections.,
then you browse for you photo which is suppose to be in you computer., upload/submit it and you got it posted
sorry if its needlessly long >.<
This pic may help a little:
http://i4.tinypic.com/10gjxu9.jpg