Click on the images on how to post pictures into your messages
Step 1Go to the bottom of the post and look at the options bar. Click the + sign on the right and it should turn to a - sign. Uncheck "Disable HTML in this post"
Step 2Now to go imageshack.us and upload your picture
Step 3Copy and paste that link into the message
******* If you picture is small enough like 800 x 600 just copy and paste the "Forum Code" not the "Forum thumbnail". You still need to do step 1 and 2 though.