Joining a Multiplayer Clan
Clans in Total War: Shogun 2 are directly tied to Steam Groups. Via the clan creation/management button, you can view a list of Steam Groups already operating as clans in the game. Choose one of these groups to bring up their Steam page, where you can attempt to join. Depending on the group's settings, you may be able to join straight away or you might have to get an existing member to invite you. Only one group can be nominated as your clan at any one time. You can leave a clan at any time, and nominate another group as your clan. If you leave or are removed from a Steam Group, you are also removed from the corresponding clan. To set up a clan of your own, you must nominate a Steam Group as your Total War: Shogun 2 clan. Via the clan manager button in the multiplayer mode, choose from a list of Steam Groups you are currently a member of and nominate one of them to be your clan. You can prevent players from making the Steam Group their clan by ensuring that the group is private, so that only those whom you invite can join. You can also kick players out of your group in order to remove them from the clan.
Click here to view a video tutorial about this subject.