First get them up on the web. Kingsnake has a free photo gallery that you can find on the header part of the page. There are others too, I use Clubphoto.com, there is free space as well as subscriber space (what I use). You have to be careful when choosing a host because some do not allow third party viewing (like Webshots.com for example). Once the photos are online, then it's just a matter of copying the URL to the image URL box on the post message box. It's that simple.