Advertisers are your companies or people that pay you for advertising space on a landing page.
The Advertiser page will list all Advertiser under your dashboard. You can add new Advertisers using the Add Advertiser button.

The available fields when adding an Advertiser are strictly for record keeping. If you want to provide access to Advertiser Dashboard, you will need to create Advertiser Users.

Getting Started – Add an Advertiser (Video)