You can join an alliance by the following steps.

  1. Tap [Alliance] at the bottom menu.
  2. Tap [Join] on the "Stand Together" pop up.
  3. [Apply] to any available alliance.
  4. Wait for approval if the alliance requires applications.

 

You can also create your own alliance by consuming 200 diamonds. 

 

  1. Tap [Alliance] at the bottom menu.
  2. Tap [Create] on the "Stand Together" pop up.
  3. Customize the alliance information
  4. Tap [Confirm]