First, navigate to the campaign where you'd like to connect the Google Display & Video 360 integration, then click "Integrations" from the menu on the left side of the screen.

Next, either search Google Display & Video 360 in the upper right search box, or click the Ads category, then click Google Display & Video 360.

Then click "Connect New Account".

If your desired Google Display & Video 360 account is not currently connected, click the "Switch Account" button:

You'll be prompted to authenticate with your Google account, so you can click directly into your email address to get started.

The integration will then be complete, and your client's Google Display & Video 360 metrics will be imported and displayed within the dashboard.