Currently all groups are private. You will need someone to send you a join link or give you the invite code.
Links can be received via email, text, etc.. For example:
Once you click the link you will install the app if you haven't already. After installation and account set up you will confirm that you want to join the group.
If you want to join via invite code you will:
Tap the "+" icon next to the Groups header on the side menu
Tap "Enter Invite Code"
Enter you code or tap "X"
Thank you for using Mazey!