Teachers and student will both need to install the Kaizena add-on. Installing the add-on is easy!
First, visit the add-on store.
Then click the blue "Free" button:
If you or your students aren't able to install add-ons for Google Docs, your G Suite Administrator can install Kaizena for everyone at your school. For more details, you can show them this guide.
Next, open Kaizena in a Google Doc.