Canon EOS Rebel T5 User Manual page 197

Clear flash settings
On the [External flash func. setting] screen, press the <B>
button to display the screen to clear the flash settings. When you
select [OK], the settings for the built-in flash and external
Speedlite will be cleared.
Setting the External Speedlite Custom Functions
The Custom Functions displayed under [External flash C.Fn setting]
will vary depending on the Speedlite model.
1
Display the Custom Function.
Select [External flash C.Fn setting],
then press <0>.
2
Set the Custom Function.
Press the <Y> <Z> keys to select
the function number, then set the
function. The procedure is the same
as setting the camera's Custom
Functions (p.256).
To clear all the Custom Function
settings, select [Clear ext. flash C.Fn
set.] in step 1.
3 Setting the FlashN
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