Yamaha RM Series Manual page 10

[5 Microphones Pairing]
The name(s) of the microphone(s) appear faintly in the window.
1 Long-press the ACTIVATE button (on the top panel of the charger) for at least two seconds.
The access point and microphone(s) are paired. When pairing is finished, the name(s) of the microphone(s) change from appearing
faintly to appearing in black.
NOTE: All microphones placed on the charger can be paired with a single long press.
2 Click the [CONTINUE] button.
RM Series Wireless Microphone System Reference Manual
10