Make a List
The password will be mailed back to you in plain text, so don't choose anything valuable. Also, note that the list name should only contain dashes (-), numbers, and letters, and letters are forced to lowercase.
Since you can't create group accounts that share a name with a list, you may want to avoid creating a list with a name that you may want to use later for an account. For example, choose "hcs-list" instead of "hcs", since you may want to use the latter for a group account later on.
E-mail acctserv (at) hcs (.harvard.edu) with any questions or issues, come to our weekly office hours during the term, or check out our services FAQ at http://www.hcs.harvard.edu/faq!