1. Click on your display name in the upper-right corner of the screen.
2. Select "Account".
3. Click on the "Google Connect" heading.
4. Click the "Google Sign In" button.
5. Select the account you wish to connect with Planbook, and enter in your login information.
This will allow your Google calendar to be connected to Planbook, allow Google Classroom items to display in your plans, or allow you to edit Google Classroom items as needed via your plans or Assignments/Assessments pages.
When connected, you can adjust which calendars or which classes from Google Classroom will be integrated with your Planbook account by checking/unchecking the corresponding boxes on your "Account" screen.