Events in Facebook account

Ok good information . but I need to ask : When we are setting up events in facebook- and I’m using the domain given to me by SAS panel- I should not use the steps in the video because it is only gives me events for a special button, the button which leads to John webinar. Am I right?
Should I do this for every Presell page in my SAS domain? and if yes how will this be done ? it is only one pixel for the Ad account?