By creating your groups, you will be able to performs groups actions and save time and clicks. To start, select the groups tab (manage > users and groups).
Your groups list will be formed by some pre-determinate groups and groups you have created. Press the new group button to create a new group and add new users.
To create a new group add the name and a little description (optional) .Rember to press the save button for changes to maintain.
Select a group and create a new message, it will arrive to all the memebers of that group.
Add new user and start using your groups.