You can download the photobucket app and use that to upload the photos to their site, then It will give you the link to post so you can post directly to the site here. Thats the only way I know how to do it, but it works great and is super simple.
I'd assume you can access google's picasa as well if you upload them on your computer from your camera first. you basically just copy and paste the link right in. I don't like photobucket because eventually the pics stop working for people after awhile.