The easiest way to be prepared is to watch any of a number of YouTube videos that will explain the process. In brief, one unscrew the bottom pot, fills it with water up to the interior line, inserts the coffee stem, adds coffee (without tapping it down), screws it back together tightly, and turns on the burner. Five minutes later, you’ll hear bubbling and see steam. It’s ready.
They make excellent coffee, by the way. Like a lot of visitors, we promptly bought one upon returning home.