The transmitters and receiver are already linked by default. If you need to link them again, you can do so in the following ways:
Method 1: Put the transmitters and receiver into the charging case and they will link automatically;
Method 2: Power on the transmitters and the receiver, swipe down on the receiver's main screen, select Receiver Settings, and swipe left to choose Link Device. Press and hold the linking button on one transmitter, and follow the on-screen instructions to complete linking. When the status indicator on the transmitter blinks green quickly, it indicates the linking is in progress. When the status indicator blinks green slowly, it indicates it has been linked and is waiting for another transmitter to be linked. When the status indicator turns solid green, the linking is completed.
To end linking during the process, tap Stop Linking.