You have to be either a registered user for iirc 6 month OR have passed a certain postcount before you can post a picture. That rule was put into effect after a bad troll attack on the site a few a couple years ago.
But if you become a paying member you can post pic right away, and get a HUUUUGE gallery to host the pics in.
But you can post links to picture galleries like photobucket or ever facebook and have us go to your place. Some of us will often even post the pic FOR you if you ask us to. Like if you think you have an infection or somehting.