When using a Stages Power LR (dual-sided power meter) unit, the two sensors are linked to one another as a set, with the left side serving as the master unit. Thus, there is no need to pair to both sides of the power meter, you will only need to pair to the left power meter when pairing a left/right set.
Once a pair is linked together, the right-side power meter will no longer be broadcasting an ANT+ signal and only the left side's ANT+ signal will be visible when pairing to your head unit. Both power sensors remain visible via Bluetooth, but as with ANT+, only the left power meter needs to be paired with the head unit in order to receive power data from both sensors.
Locate the ANT+ ID sticker on the inside of your left power meter crank before pairing.
- Pairing via ANT+: Follow your head unit manufacturer's instructions to add the power meter, identifying it on the list of devices by the left side power meter's ANT+ ID (printed on the sticker below the power meter pod).
- Pairing via Bluetooth: Follow your head unit manufacturer's instructions to add the power meter, when viewing a list of devices, identify the left power meter based on the sensor name, which should include the left power meter's ANT+ ID (i.e. Stages 12345).
See also: How do I link my Stages Power R meter with my existing left-side power meter?