Well, this really should have gone in the Help Forum, but so this page has some necessity to it, I'll help.
Right, you make the image, then you make an account (or log into an already existing one) on a image hosting website. Such ones would be Photobucket.com or Tinypic or something. Look around for the best one.
Then, you "host" the picture on their website. It will be stored there, and from there, you can then post the link to it, or just copy the IMG code and post it here. Then it will show up once you hit the Submit button.
Hope I helped. PM me or a moderator (Gym Leader) if you have any more questions.
