There are 2 ways to do it. If you've noticed, some guys add pictures to their posts as an attachment. (They show up as thumbnails and you have to click on the attachment to really see the picture. To do this, you resize your picture so that the resulting saved jpg file is less than 97 KB, Something around 600 pix X 400 pix should get your there. If not just resize accordingly. If you go that route, in your post, you will see a paperclip in the upper righthand menu. Click that paperclip and browse to your saved file on the computer.

The second method involves hosting your picture on a picture hosting site such as imageshack.com or photobucket.com The pictures should be resized prior to hosting them. Again, something in the 600 X 400 is good size for direct posting in a thread. If you go the hosting site method, you copy the forum URL link that is established on the hosting site and just paste it in your post. Clear as mud, right? Go to the Site Help forum and start a "test" thread to practice posting a picture. We can see what you are doing, right or wrong and walk you through it.