Deals feature will help you to find in one place coupons (voucher codes) and promotions from advertisers.
Good news, for most of networks you don't need set a new connection, but for some of them you will have to add more informations.
Go to Manager, Networks and click on the tag icon :
Then you will have a to fill in credentials to add the connection :
Here is the list of networks that you will have to add credentials for Deals: