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Add existing contacts to groups
You'll see a list of all your contacts on the right side of your screen. Select the contacts that you would like to add to a group and click on 'Add to Group'.

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Choose the group you would like to add them to from the drop-down menu and hit ‘Add to Group’.

Done!
Vice versa, use the button 'Remove from Group' to delete contacts from a group. For more information on removing contacts, read one here.