The Facebook pixel enables Facebook to track traffic from Facebook Ads. This allows Facebook to determine if the ad achieved the desired outcome. The pixel must be setup in Facebook and then placed on your destination pages. This marketing system allows you to enter your Facebook pixel so it can track Facebook ad traffic to the surveys. Follow the process for setting up a Facebook pixel. When you are there you can see if one already exists. You can also check if the pixel was entered into this system.
link to setup the Facebook Pixel
link to enter your Facebook Pixel into this marketing system