There are two types of moorings the one on the utube and the other and most common one is where the main mooring line isattached to a yellow or red float with a light line from float to main line which has a loop in the end. It is that main loop that goies onto your bow cleat with a small rope around the line to lock the loop into place. Not the small line. I see lots of ppl that just put a line thru the handle of the float. My boat lives on a mooring where birds eat away the small line to the float thus making it very weak which would have broken off if any weight was put onto it, so if it broke the main line will sink to the bottom and boat would float away.
Hope that is helpful?