Try User CP on the lower header bar. Near the bottom is a box for 'paid subscriptions'.
Why do you want to pay? It's easy to post pics using Go Advanced (under the reply box) then Manage attachments to upload from your hard drive. After they are up, close the box and look below your reply for the links, open a pic and save it's location and paste that into the pic icon box...
His friend Jerry Dillon looked up at the hillside and said; There is a big ledge, and the whole damned hill is a total wreck with quartz boulders of ore.