The third step of setting up Relay is deploying the Google Chrome extension to your users and setting up optional Google Admin console settings.
Deploying the Google Chrome Extension
Open the Google Admin console and navigate to Device Management.
Click Chrome Management from the left menu (Device Settings), then click User Settings.
Choose your organization from the left menu (Organizations), then scroll down to Apps and Extensions > Force-installed Apps and Extensions. Click on Manage force-installed apps. Click on Specify a Custom App.
Enter your organization-specific App ID and URL in the ID and URL fields. Then click Add.
Refer to the Relay Getting Started page and click Details
(step 3. Deploy the Google Chrome extension) for the App ID and URL. You can also find your organization-specific App ID and URL on Relay’s Settings > Chrome Extension
Once added, the App ID is listed in the Total to force install list. Click Save to push the extension.