you need to have the photo uploaded on the net first
you choose a photo you found on a given website, right click it to get to the url (address of the photo)
and then write here in the post:
(img)URL(/img)
you have to convert (s to [s and )s to ]s and URL to the address of the photo.
if you have the photo on your computer use some kind of website that lets you upload photos, try:
1) [
imageshack.us] for a few photos
2) www.photobucket.com/ for larger collections
is it clear now? write if you need more help!