First, navigate to the campaign where you'd like to connect the Synup integration, then click "Integrations" from the menu on the left side of the screen.
Click on Synup in the list of available integrations.
Then click Connect New Account.
In the window that appears, enter the API Key for your Synup account. If you're not sure where to find those credentials, please contact Synup support. Once you've entered your credentials, click "Save".
Next, select the client you want to connect and click "Save".
If the client that you would like to connect is under a different Synup 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.