The particular model I have is the Helix Syn Trident. It says in the instructions that you need to contract and relax the sphincter muscle. Does this mean doing kegels?
A little late to the party but yes. You want to contract your PC muscles(Kegel Exercises). It does take a lot of practice to strength and contract them correctly. My first times doing I was also contracting the sphincter which is an upwards movement. It should feel like your driving your sphincter into your bladder. Best way to feel what it should feel like is to stop peeing mid stream not pinching off a number 2