Go to http://lists.maine.edu .
You will need to create an account here. Select Get Password (on the right side of the screenI suggest using your maine.edu address as your username. You will receive a temporary password. Change it to something you will remember. This password is NOT synched with your other passwords!
Once you have established your account, go to Log in.
After you are logged in, you will see an alphabetical list of lists that are available to subscribe. Select the one you would like to join and click Subscribe or Unsubscribe (on the right).
Check that the info displayed is correct and click Subscribe.