The add-on needs to be opened from inside Google Docs, so the first step is to open a file on Google Docs.

Next:

Here's what that looks like:

The first time you open Kaizena, you'll see a message saying "A script attached to this document needs your permission to run." - click "Continue."

You'll see a popup asking you to select your account: if you have multiple Google accounts, make sure to select the account you use with your students.  Kaizena will ask for permissions - click "Allow":

If you want to know more about what these permissions mean, just email us!

Next, you're ready to sign in for the first time!