Posting to your gallery is pretty easy - go to the below link, and click on Upload Photos link over on the right hand side of the page.
First you get a place where you browse to the location on your hard drive of the image you want to upload. It has to be no bigger than 600x600 pixels and file size less than 125k. There is some other stuff on that page, but nothing you'll need to mess with. Click on the button on the bottom - can't remember if it says OK, or Submit or UPload, but you'll recognize it.
Then this brings you to a second page where you fill in information - the title, the description, any credits etc. After filling in the information, again click on the button on the bottom. Wait a couple of seconds/minutes and Voila, there it is.
lucian's gallery
Hope this helps.