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In this article I will show you how to access the new area for "groups" which have been converted to "Labels" on Gmail.
First we will click the contacts button on the right side:
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Secondly we will want to open the window in a new tab:
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Lastly you can now see all your labels and edit them as needed. If you want to add a contact to a label just click the "Edit" tool and click "manage labels" below the profile picture.