register with a photo hosting website. I like flickr the best, a lot of people use Photobucket.
After registering you'll probably be asked to upload right away or find the command to upload.
Point to the picture on your computer and click. You should see something giving the path to the picture.
Once uploaded you can often resize to keep things from being grossly oversized in a browser window.
Once pictures are uploaded there is an associated link to the picture.
There may be more than one link. Look for the link that says discussion boards/forums etc.
Theres a topic ready in the Off topic area here.
you should be all set