Enable to post a picture on this forum or any forum, you need to upload it from your computer to a server on the internet. The most common way of doing this is by free online image gallerys. If you don't have a online image gallery already, get a free one from http://photobucket.com/
! Signing up only takes a few seconds, and your be uploading photos in no time!
Once you have your photos uploaded, select the entire text in the Img section as shown here:
while the text is selected, press CTRL+C. Now go to the forums, and start a new topic, or reply and press CTRL+V. You should see text similar to this appear:
Save the post and your done!
p.s. I am terrible at writing HowTos, so if anyone out there wants to write a better one please do! I'll delete mine and makes yours sticky!