School Pack Teachers
If your MarvellousMe app has been been setup your school, you don't need to do any setup or upkeep. Just ask the school office to assign you to the classes and groups that you want to use MarvellousMe with. They can assign you to multiple groups and keep everything always up-to-date for you.
If you are a solo teacher and signed up yourself, you need to setup your own classes, add pupils and hand out the parent join code letters. This is very easy to do. Start by tapping 'Setup' on the top bar and then follow the guides. You can watch a video here.