by VanessaE » Thu Oct 11, 2012 22:58
Upload your screenshot to a service such as ompldr.org, flickr, etc. then copy the address of the image from your address bar, and put a link to it in your post, in the form of:
[img]your%20link%20here[/img]
As long as the link leads to the actual image file (e.g the link you copied ends in .png or something), it should work fine.