What's the difference between an Account Holder and a Viewer?
The Account Holder is the main contact responsible for a School or Library subscription. This person will receive all communication in regards to the subscription, including billing. They are also able to amend their account details in their Account Settings when logged in.
Viewers have a different password which only provides access to story content (not account settings).
Make sure you never use the same password for both Viewer and Account Holder, or viewers will be able to access account settings!