Deset poštanskih markica, molim vas means “Ten stamps, please”.
You stick the ten stamps onto a dessert without a radio – the image for ten from the very top of the body list: deset. With that you go to the post office, where the man behind the counter punches a hole with his stamp and giggles while doing it: post, punch and giggle give you poštanskih. The stamps tickle him on the tooth – stamps, tickle and tooth give you markica.
Because the number is above five, markica ends in an a – exactly the rule from the previous video.