If you are not already a member of a group, you can make your own! In order to create your own group, you need to be level 35, and pay 500 diamonds. You can join a group once you are level 16.
Tap on the ‘Me Tab’, and then tap on the group icon You can then choose from a list of stickers that you feel represents your group the best. Enter your group name, a group description and select how people can join – you can choose to have anyone join, invite only or if people are able to request to join your group. You are also able to restrict who is able to join by level. Once you’ve created your group, then you will be able to start adding members!