Using the Google Hangouts Power-Up
The Google Hangouts Power-Up attaches a persistent video chat to the board in the top right.
Enabling the Google Hangouts Power-Up
To enable the Google Hangouts Power-Up, open the board menu on the right side of the board. Click "Power-Ups", and then "Enable" next to Google Hangouts.
Using the Google Hangouts Power-Up
Click the Google Hangouts button that shows up in the top right corner of the board to be directed to a unique Hangout.
Disabling the Google Hangouts Power-Up
To disable the Power-Up, open the right-side board menu and click on the Power-ups link. Then, next to the Google Hangouts Power-Up, click on the gear icon, and then click Disable.
Clicking that link will remove the Hangouts link in the header of the board.