After you have added your school's students into CritterCoin, they can claim their account and sign in to see their achievements.
How to claim a student account...
1) Go to https://www.crittercoin.com and click the "Student Signup" button in the top menu.
2) On the next screen enter their school email address. (It must match the student's email that you added in CritterCoin.
3) Check their email inbox, junk and spam folders to finish the process.
Once they have completed the steps above they can sign in on the web or mobile app.