Is there a "pic post for dummies" somewhere

[druggr]

I have been searching past posts and although many talk about use of a 2nd or 3rd party to post pic's, I have no idea what needs to be done.

I have a seat for sale in the classifieds and would like to put up pictures but have no idea what "PB" or "img" is.

What kind of seat, what does it fit, and is it heated ???