The radio receiver is now electrically connected to the flight controller, however, in order for the radio receiver to process signals from the radio transmitter we must virtually connect the two in a process called binding. Binding pairs the radio receiver and radio transmitter so that the devices recognize each other and are able to communicate.
First, turn on your radio transmitter and connect your battery to the battery connector we soldered onto the Q Brain a while back. With both the radio receiver and radio transmitter turned on, locate the bind button on the radio receiver. The bind button is located in the corner of the radio receiver in the upper-left corner of the label.
Press the radio receiver bind button and keep an eye on the color of the light on the radio receiver. When the light turns green, release the bind button. The light should now stay green to indicate that the radio receiver and transmitter have been successfully paired. If the light on the radio receiver flashes alternately green and red, the binding process failed, so just try again and it should work fine.
Conveniently, binding the radio transmitter and radio receiver is a one-time process. From now on, unless you bind the receiver to a different transmitter, the two devices will be able to communicate.