Once logged in you may receive a popup with username/password, that is normal and can be closed/cancelled since you used Google. It may log you out, you can just log right back in with Google:
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Creating a Club
You may want to create a club prior to registering students as you can automatically enroll them in the club while registering if it already exists.
Alternatively you can add the students to the club after the fact.
When creating a club please ensure 'enable forums' is set to NO and members list is set to Admin only:
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Signing up / registering students
From your teacher account go to Manage → Kids
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On the right side go to Add a Kid (or multiple if doing a class/club at the same time):
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Choose or enter a username and a default password (make it something simple that will be generic and used for all students, they will change it after logging in the first time)
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Go back to Manage → Kids and you'll see the new accounts. You can click the 3 bar / hamburger menu next to each account to manage them (Edit Kid).
IMPORTANT!
Change/update the permissions on each kid account to DISABLE messaging, club forums, friends.
The system should not be used if these are enabled.
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Use the 'Print Login Cards' on the right side to easily distribute the student's information the first time: