First, navigate to the campaign where you'd like to connect the Centro Basis integration, then click "Integrations" from the menu on the left side of the screen.

Next, either search Centro Basis in the upper right search box, or click the Ads category, then click Centro Basis.

Then click Connect New Account.

If you haven't already done so, you'll be asked to enter your Username and Password for your Centro Basis account.

You'll then be shown all available Centro Basis accounts linked to the credentials you've entered. Choose the exact account you'd like to integrate, then click Connect.

Your client's Centro Basis account will then be connected to the dashboard.