I am wondering if there is a way to add tags to an entry that a user posts on the front end. I have MovableType 4.21 installed with the Community Solution. Users can log in and can post but are only given a title and a body field. I am hoping that users can also tag their entries.

I just want something like:
<input type="text" name="tags" />

Is this possible within MovableType? If not, does anyone have any ideas on how I could 'hack it' to get it to work?