connection of the propeller with the engine (revolute joint)

I've problem with connection of the propeller with the engine. I've read somewhere that I should connect it as revolute joint but I don't think I know how to do it. I've been using this website: https://skill-lync.com/student-projects/week-11-joint-creation-and-demonstration-78. I note that my model is a moving drone with spinning propellers. The propellers must be connected to the engine so as not to come off immediately.