Conehead555, thanks for pointing that out. I've fixed that format flub. There's nothing that the end user needs to do however to select an avatar. They're built by the site dynamically for each user, much like MonsterIDs.
To configure the plugin, go to
Settings -> Options -> User Picture Options
There you can set the type displayed, what size it is and if you want to make use of Gravatars.
The plugin does not add avatars to the selection list. It changes the
default avatar and displays automatically for any user who does not have an avatar chosen.
Let me know how it looks with the new version installed [allow overwrite on import] and if you have any further questions.