Dear [Power User's name]:
I have invited you to become a power user for Vocabulary.com's subscription. By now you should have received an auto-generated message from Vocabulary.com, inviting you to set up your account. Once you do, you'll be able to create and assign Vocabulary Lists, create classes and monitor all of your students' progress, not to mention see all the activity on Vocabulary.com at our school. You'll also be able to invite other power users as well as teachers to the account.
The email message contains a link that will get you started. If it's not in your inbox, check your spam folder.
Please let me know if you have any questions.