It's not so bad once you've got it figured out.
What you do is:
1. find a pic on your computer
2. choose a 'host site' like
www.imageshack.us or
www.photobucket.com and get a free account. this is something that you can use for all forums forever.... (unless they go under)
3. from image shack or photobucket find your photo on your desktop and upload it to the site. it will generate some code for you.
4. find the code with these
on the ends and copy it. paste it here on the forum wherever you want.
that's it.