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You need to first be accepted into the clan. Once you have founder approval you will be able to "Set as Xbox Clan" or "Set as Playstation Clan" next to the "Interact" button on top of the page. Once you set the clan the [RAGE] clan tag will be under your name when you play.
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In the Admin panel of your clan page under "Clan Features" there is a box labeled Clan ID. I think you can add up to 4 or 5 characters for that box, typically an abbreviation for your clan name. You can put it there.