If you'd like to post pictures, they first have to be posted somewhere on the Net. I use Flickr, myself. Then, once you have the URL, you insert it in your post by using the image tag, as follows: [ img ] URL [ /img ]
The spaces are there to make the code visible and must not appear in an actual post. Please do not include more than ten images in a single post. If you have more than ten pics, that's fine, just don't put more than ten per post.