Now that you've accumulated more than 15 posts, you can use the [IMG][/IMG] tags to do this. Simply upload your image to a hosting site like Photobucket or Imageshack, get the direct link, and place it in between those tags. So, say the URL was
http://www.yourimagelinkhere.com. You'd do this: [IMG]http://www.yourimagelinkhere.com[/IMG] The picture would appear in your post. :D
Welcome to the community, by the way. Looks like you're starting to get your barrings around here, and if you don't wanna use your introduction thread for future questions, you're always free to send me a message. Or, well, you could send any of us staff members a message. We're all pretty friendly.
See ya~