As far as I know, there are 3 ways to post a picture on the forum.
-One way, (which are the posts that have sentences inbetween them) are posts where the picture is a url.
You click the picture icon and a screen will appear, this is where you can enter the url if your picture is located on another website, such as photobucket.
Do you have the icons like below? If not you need to go to your UserCP and change your text editor to the STANDARD EDITOR
-Another way is to scroll down past the text box, and click on "Manage Attachments"
When you click on "manage attachments" a screen will pop up where you can browse to the picture on your harddrive, then be sure to click upload.
Once you upload the pic it will be automatically attached. You can add up to 5 pictures but the total kilobytes for the pictures cannot exceed 195k. Then just close the Manage Attachments screen, and click submit.
Hope this helps
Carol K