How does it work in the front? Does it block ads and those blocked ads get clicked? Many times, it shows me no ads but it also displays 0 ads so nothing is clic

How does it work in the front? Does it block ads and those blocked ads get clicked? Many times, it shows me no ads but it also displays 0 ads so nothing is clicked. Do we have to allow it to display all ads on the page to let it click? Sorry but it's somewhat confusing for me.