Download the app from App Store or Google Play, or if you are on a computer, go to app.360player.com
When you are in the app, create your account and use the group code that you have been sent!
Parents can also get the app, and either create an account for your child, or connect to an existing child account!
Just make sure, that if you are creating a new account for your child, that you still select Parent when creating the account.