http://thespoke.net/admin/blogs/postlist.aspx?App=bogo
You can access this by clicking My Settings in your Blog, and then click Posts in the Sub Menu at the top.
Galleries is similar.
Once you have Categories defined, you can make a post or add a picture. While adding/typing text, click the Advanced Options at the bottom and you can select what Category you want to add it to.
Thanks!
Eric A. Duncan