Most model's come pre bound, if yours is not bound you can rebind it with the bind plug supplied with your model.
Just turn on the receiver and put the bind plug in batt/bind port on receiver.
When the receiver led flashes fast you will need to remove the bind plug and turn on the transmitter hand set.
The bind process will take a few seconds
Some handsets also have a bind button signal, press this and turn it on at the same time , this will send the signal to the flashing receiver to bind.
Please always read your manual as it may provide you with some different instructions for this process