First, navigate to the campaign where you'd like to connect the Unbounce integration, then click "Integrations" from the menu on the left side of the screen.
Next, either search Unbounce in the upper right search box, or click the Analytics category, then click Unbounce.
Then click "Connect New Account".
In the window that appears, you will be asked to enter your login credentials. Once you've entered your credentials, click "Sign In".
Next, select the client you want to connect and click "Save".
If the client that you would like to connect is under a different Unbounce account, you will need to enter different credentials to access that account. To do so, click the button that says "Connect New Account" and follow the above steps.