Tribes are a major part of Tribal Wars, allowing players to group up to support each other and eventually win a world. Here you can apply to a tribe that has caught your eye or accept an invitation you've received from a tribe's recruiter. It's also possible to create your own tribe if you want to try leading others.
If you are not part of a Tribe already, just go to the Tribe menu at the top of your screen. There you can establish your very own Tribe!
It is strongly recommended that you find a tribe to join as soon as possible if you are a new player. While it is possible to create your own tribe, we would recommend waiting until you have more experience to do so.
In order to join a tribe you will either need to receive an invite, apply to an existing one, or join find an open tribe where anyone can join. To view a list of tribes, you can click on Rankings and then Tribes. However, you may prefer to view tribes that have a strong position on your continent, in which case you should go to Rankings and then Continent Tribes. Most tribes will typically show whether they are recruiting or not on their profile. They will also list the name of the leader or recruitment manager. This is the person you should mail to enquire about an invitation.
If you aren't happy in your tribe, it is always possible to leave. Click "leave tribe" to leave your tribe. You find that button when you click on "tribe", right above the internal announcement. Note that this is subject to world settings, some worlds do not allow you to leave your tribe.