Use any 2 power cords to begin with to see which tension you like best. It should be on the lighter side as a beginner.
Lie on your side with your torso propped on your elbow and forearm which are on the Glideboard. Place your upper foot on the footbar parallel to your body, toes pointed to the side. Bend your bottom knee and relax it on the Glideboard. Now push against the footbar with your upper leg until it is straight. Pause for a moment, then bend your knee in toward your chest, keeping the foot pointed directly sideways. Keep your hips stacked and contract your abs to avoid rolling forward or backward. Continue to straighten and bend your knee until you begin to feel a burn. Repeat on the other side.