Canon Speedlite EL-5 Advanced User's Manual page 142

6.
Set the flash mode.
Press the joystick vertically or horizontally or turn <
flash mode, then push the joystick straight in.
Descriptions next to <
settings.
For details on Custom flash modes, see
7.
Set the transmission channel and wireless radio ID.
For instructions, see
Radio
8.
Set up shooting on the camera.
9.
Set up all Speedlites.
In the linked shooting setting, set up all Speedlites you will use in linked
shooting as senders or receivers.
Do the same for any transmitters you will use.
Changing a Speedlite from receiver to sender in step 3 automatically
changes other Speedlites (or transmitters) that were set as senders to
receivers.
10.
Position the receiver cameras.
Position all receiver cameras within approx. 30 m / 98.4 ft. of the
sender camera.
Confirm that the <
Setting the Transmission Channel / Wireless
ID.
142
>–< > vary depending on the registered
Custom Flash
> lamp of receivers is lit in green.
> to select the
Modes.