First off let me link to the WordPress Plugin page for Profile Builder.
You can find all the documentation there, but if you still want to know how I use it then please read on.
Now a list of the key features of this plugin:
- *Minimum password length/strength
- *Enable/disable user login with email and/or username
- *Content restriction
- User Role editor
- Email Confirm on new user registration
- Show/hide the admin bar by user role
- Profile Form Field Editor
- Shortcodes