you used to be able to attach the pic in the reply section of this site, but i do not think that feature works anymore. You have to host the picture somewhere on the internet.
www.mustangmods.com is free. You upload the picture to there then just copy/paste the link here on the forum.
You may have to resize the picture if it is to large. If you are using XP there is a small Picture Resizing program you can download from microsofts site. Its in the Powertoys program. Hope this helps