You mean post pictures online so you can show other people? You can register with www.photobucket.com
and I believe they are still free. Sony has their imagestation.com but they charge now. That's why I cancelled with them. I like www.imageshack.com
because you can link pictures anywhere with them.
To post pictures on this forum, click on the "Insert Image" button from the formatting menu. Then copy the URL of the image you want to post and hit ok.