Summarize the following:
Depending on what kind of pedals you have, you'll need either an Allen key or a 15mm wrench. Press down on the pedal with your foot and hold the brake to prevent your bike and pedals from moving. Bend down and insert the Allen key or use the wrench to loosen the bolt on the opposite side of the pedal. Continue to unscrew the bolt until the pedal comes off.You may need a friend to help you hold the bike in place while you unscrew the pedals. If you have a quick-release wheel, all you'll need to do is undo the latch on the front of the wheel and turn the latch counterclockwise to loosen the wheel. If your wheel is secured with a bolt, you'll need a 15mm wrench to remove it. Loosen the bolt on the center of the wheel by turning the wrench counter-clockwise. You may have to loosen the brakes to remove the wheel. Deflate your tires to make more room in your shipping container for the rest of the bike. Doing this will also prevent the tubes from popping while you're shipping it. Unscrew the caps on your bike's tires and softly press down on the needle in the center of the valve to release the air from the tires.Don't squeeze your tires before you depress the needle or you may damage them.

Summary:
Remove the pedals. Remove the front wheel. Let the air out of your tires by pressing the needle on the nozzle.