Got this from their FAQ, took me about 30 seconds.... thats why I'm a googlist

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When you first create your forum, you will find your groups in your admin panel in "Users and Groups >> Groups Administration". You will find two are already made, administrator and moderator. The title of these, and any other group you create, shows in the legend bar at the bottom of your forum, when set correctly.
Creating a Group
Spoiler:
You will see in the above picture, the two create a group buttons, above and below the 2 groups present. Click either of them they both lead to the same page shown below.
Spoiler:
- Fill in the name of your group first followed by the description. The group then needs a moderator, either add your own username or another member of your team's user name.
- If you would like the members of your new group to have coloured usernames that show throughout the forum and in the legend, you can then click the box indicated in the screen shot below to choose a colour for your group. It wil automatically fill in the hex colour box to the right of it.
- If you have chosen to colour your group, check the 'color group members' box, then you can choose what order your group appears in on the legend. Number 1 appears first.
You can then choose your group status:
- Open: Anyone can ask to join this group and the moderator will approve or deny applications.
- Closed: Anyone can view this group, but they cannot request join it. Only the group moderator or administrator can add or remove members.
- Hidden: This group cannot be seen by normal members, the moderator or administrator can add to or remove members from it.
Finally you can choose the type of member that is allowed to PM the members of this group. Once done click save.