How to connect my Facebook ad account?

Answer 1

This is done automatically via the Business Dashboard when you proceed to create a Facebook Ad from the same.  
Follow the steps given below:

1.  Select the Facebook Ads option from the Navigation Menu.
   
2.  Ensure you are logged in to the Facebook Account on the same browser you are accessing the dashboard from, and click on the Create Ad button. 
   
3.  In case you are not logged in, a prompt window will open that will request you to sign in to your Facebook Account.
4.  Ensure the Facebook Account you are connecting to has access to the Ad Account you want to run the Ads from.
5. On successful connection, the next step to Create your Ad, which is Ad Account and Page selection will show up.