Playing is more fun with friends, that why you can invite your friends to your island and play together!
To do that, go to the server and execute the command /is team invite (player). The player will then receive a notification and will need to confirm. Once he does, you can check the team members by using /is team. However, there is a limit on how many members an island can have. To increase the member spots, you can purchase a rank on our store at http://store.aysminecraft.com/.