Click New Advertiser.
Add the new advertiser's name and information, and Save.
You're all set! Remember that each different advertiser uses their own Site Tracking Tag. Return to this dashboard at any time by hovering over your name and finding the green 'Manage Advertisers' button. From there, you can view different time frames, click into any of your advertisers, or deactivate an advertiser if needed.
Please note that each new advertiser you add will go through the same Site Audit process to ensure their website adheres to the guidelines.