What happens next?

How to ship a bicycle cheaply
Use an allen key to unscrew the handlebars from the bike.
Put the allen key into the screw on the front of your handlebars. Turn the wrench counterclockwise to loosen the screw.
Once it's loose, you should be able to lift your handlebars from their housing. Place the screws and bolts in a zip lock bag to keep the smaller parts together for when you want to reassemble the bike later.