The users feature of RumorMill allows you to create a list of users that have access to your RumorMIll server. Users are an optional feature and simple installations of RumorMill will not need to create users.
However, if you wish to limit access to your server with a more discriminating approach than using Restrictions, creating users is a good option. By creating users, you can limit access to your server by individuals rather than particular computers (IP addresses). And, when users are used in conjunction with Usergroups you can also control which groups individual users can read from and/or post into.
Creating users is straightforward - just use the Add..., Edit... and Duplicate... buttons to create or modify users. The Delete will remove the selected user without any confirmation.
You may create as many users as you choose. The only limitation is that user names and their passwords must be 31 or fewer characters.