You can create a group by clicking the “Add Group” button once you log in and open your address book. Two fields will then appear on the right. Under ‘Name’ enter the name you want your group to be called. Below the ‘Members’ box you can either begin typing the name of one of your contacts and then select it as it appears, or if you click on the search bar you will see a list of all your contacts and you will be able to select any of them to add to your group.
After adding all the members into your group, be sure to click ‘Save’ at the bottom right of the screen. You can edit your groups at any time.