Canon Speedlite 430EX III-RT - Manual (Page 73)

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Wireless Settings
To perform flash shooting using the optical transmission wireless slave
function, configure the settings as follows.
Set to < :x >.
Operate and set the flash you want to
set as the slave unit.
Press the < I > button of the < S >
cross keys.
Turn < 9 > to select < :x >,
then press < 8 >.
To avoid interference with optical transmission wireless flash systems
used by other photographers, you can change the transmission
channel.
Set the same channel for both the master unit and slave
unit.
Set a channel.
Press < 8 >.
Turn < 9 > to select the channel
symbol, then press < 8 >.
Wireless Settings
Slave Unit Setting
Turn transmission wireless sensor (p.10) of the slave unit toward the
master, using the bounce function (p.28).
When shooting indoors, since the transmission signal is reflected off the
walls, operation may be possible even with slightly imprecise positioning.
Transmission Channel Setting
To perform normal flash shooting, select < F > to clear the wireless
(slave) settings.