How to setup the Bing Ads integration
First, navigate to the home dashboard for the campaign where you'd like to connect the Bing Ads integration. Then, choose "Ads --> Bing Ads" from the dark navigation bar on the left-hand side of your screen.
Next, click the link in the middle of the screen that says "Connect Account".
Enter your credentials when prompted.
You will then be prompted to select the customer account which you would like to connect. Click the radio button next to the appropriate account, then click "Save".
If the account that you would like to connect is under a different Bing Ads account, and you need to enter different credentials to access that account, click the button that says "New Account", then enter the appropriate credentials, and step through these screens again.