To post pictures, you can use HTML code or UBB code.
What is UBB code? Read this:
http://www.ffcars.com/cgi-bin/ultimatebb.cgi?ubb=ubb_code_page
I like using HTML, to add a picture you would use the following code, except where I have ( put a < or >
(img src="http://www.ffcars.com/picture.jpg")
Be sure your pictures are hosted somewhere that allows you to link to other sites. I know some free services only allow the pictures to be seen on their web site, not linked to others.