Btw, you can also add a picture as an attachment on the forum. (Which I like as there is nothing worse than finding an old thread and seeing those "Image no longer on Photobucket" messages.)
When you are drafting your post there is an expandable section underneath labelled "Additional Options..." that allows you to add the pic, in the same way that you add an attachment to your webmail. Just need each pic to be under 256KB.