First of all, in order to post a picture here, you have to have 100 posts. Until then, you can only post the links.
In order to do that, you have to upload your picture to an image hosting site, such as photobucket or image shack (they're free!). Then, use these codes:
For a link: <font class="small">Code:</font><hr /><pre>address here or address here]title of link </pre><hr />
For an image:
We also have a photo manipulation thread, located here, where you can post all of yoru mainips.