Welcome to the forum!
Here's what you do to get pics on the site:
1. Go to a site like tinypic, imageshack, or photobucket (you'll need to make an account for photobucket, but it's free).
2. There will be a bar where you put your picture in. Click 'browse' and find the pictures you want to upload.
3. Click the upload button!
4. When it's done uploading, your picture will have a few codes beside it. Copy and paste the one that looks like this:
[ img]urlhere[ /img ]
And post it!