I see that some people can’t find the way to add a group tab to their FB page,
so here goes:
PART 1 - GET A GROUP TAB
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On your FB page, click on SETTINGS on the top white bar
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Click on EDIT PAGE
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Click on ADD A TAB
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Select GROUPS
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Drag the groups tab to the list of tabs
PART 2 - CONNECT GROUPS TO YOUR PAGE
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Go back to your FB page, it now has a GROUP tab, so click on it
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Click LINK YOUR GROUP
Now you can use your PAGE on your GROUP
(something that was not possible until recently)