Yongnuo YN-E3-RT - Custom Function Settings for Transmitter; 1. Select Flash C.Fn Settings; 2. Set Specific Custom Function

Transmitter Custom Function Settings
The displayed contents vary depending on the camera.
If C.Fn-20 and 22 are not displayed, set them by
operating the transmitter. For the Custom Functions,
see pages 26 to 27.
1.Select [Flash C.Fn settings].
Select [Flash C.Fn settings] or [External flash C.Fn setting].
You can now set the Custom Functions of the transmitter.
2.Set the Custom Function.
Select the Custom Function number and set the function.
To clear all the Custom Function settings, select [Clear all
Speedlite C.Fn’s] or [Clear ext. flash C.Fn set.] in step 1.
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