1. You need to host the screenshot. I reccomend using
http://imageshack.us/2. Upload your screenshot!
3. After you have uploaded it, look for the direct link to the screenshot.
4. Copy and paste this into your post, highlight it and click on the Img body which is under subject and to the right of the thing that says message body.
OR
you can just attach an
at the end.
There are other ways but this is how i do it =)
Enjoy posting your screenshots!