Canon EOS Rebel T5i 18-55mm IS STM Lens Kit 手册

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You can use the built-in flash 

for wireless flash shooting.

The camera’s built-in flash can work as a master unit 

with Canon Speedlites with a wireless slave feature and 

wirelessly trigger the Speedlite(s) to fire.

Canceling the slave unit’s auto power off
To cancel the slave unit’s auto power off, press the 

camera’s <A> button. If you are using manual flash 

firing, press the slave unit’s test firing (PILOT) button to 

cancel the auto power off.

Be sure to also read the information about wireless flash 
photography in the Speedlite’s instruction manual.