Start by securing the cleat to your shoe. The best position is centered under the ball of your foot, with the point of the triangular cleat facing forward. Once in position, tighten the three mounting bolts with a 4mm Allen key.
To engage the cleat into the pedal, move your foot forward and down at about a 45-degree angle to the pedal, so that the front of the cleat slips under the lip at the front of the pedal. Practice somewhere safe before you attempt it on the street. Use a stationary trainer, or friend, to help you stabilize the bike.
With the front tab of the cleat hooked under the pedal lip, step down onto the pedal to snap the rear edge of the cleat into the pedal. The pedal uses spring tension, so you should hear an audible click.
To unclip your shoe from the pedal, pivot your heel sideways and away from the bike. Practice is a must. With one foot securely on the ground, try engaging and releasing the opposite foot several times to get the hang of it. It's a simple move, but one that you want to have down pat before heading into the street.
When you're ready to ride, clip one foot into a pedal, and push forward to start the bike rolling. When you're stable and moving forward, repeat the process with the opposite foot.