Adding pictures: You need to capture the pic by using the PrtScr key (if using a PC, sorry don't know the routine for a Mac), or using a capture program.

You can then upload your pic to a free pic hosting website like http://www.photobucket.com (free - and you can google for others).

Most of these sites have a clear, easy tutorial to walk you through uploading if you need it. Once the pic is uploaded, the site will generally offer you at least three options to use for posting. The best one is the "img...". You simply copy the img url in your post, and you're done.