Click on your name in the top Header Bar. You will see ‘Profile’. Click on this and you will see your Contact Details and the heading: ‘Groups’. Click on the blue cog and you will see the list of available Groups. Scroll down to find a Group you wish to join, point to it with your cursor and double click. Your choice will now appear in the list ‘Chosen Groups’. To leave a Group, point to the Chosen Group you wish to leave and double click.