Go to dotLRN Administration at http://yourserver/dotlrn/admin. Make some dotLRN users, terms, departments, classes.

Here are some suggestions for things to check out in dotlrn:

Goto /dotlrn your "workspace". Click the "My Account" link at the top and try the "Customize this portal" link there. Goto the admin pages for a class or community and try the "Manage Membership" link. Create a new sugroup for a class or community. Edit or create new "Custom Portlets".