"Check the box to accept the terms of use and the privacy policy."
Where: Create your school screen (account creation).
Why: the box "I accept the terms of use and the privacy policy" is not checked. It is required: the acceptance date is kept with the account.
What to do: read the privacy policy (link under the box), check the box, then tap Create my account and continue.
Didn't find your answer?
Write to bonjour@martialnote.com from your account's address, saying which screen is involved and the message shown. Support is by email only, with no guaranteed response time. Never send information about your students.