Clan Invites are a function located under Your Clan. The leaders of other clans can send invites to you, and if you accept, you are automatically in their Clan. Though accepting to join a clan would mean you would lose all Clan Credits and remove an application for a different clan if you had one. Changing Clans also affects your Clan Experience by bringing it back down to zero and effectively erasing it from the game and being undoable.