When you go to post look down below the submit button at the additional options. Click on manage attachments. You can also use photobucket or a site like it and get the forum code and put it on the post.
See at the top of the page where it says user/cp, click on that! If you dont see it click on home and see if it appears. Off to the left you will see pictures/albums. Click on that and go in there and create an album and upload pictures you want to post in that album. Once you get the picture in the album, click on the picture to view it...you will see 2 lines at the bottom of the page......URL and BB. To post a picture into a thread so the picture appears, copy and paste the BB line into the thread.