How do I reduce the power output of my Canon 450D built-in flash?

450D User

New member
I've been searching the internet to the answer to this question, none has been useful.

I have a Canon 450D and an external flash that has a slave function. As I am aware of, you can trigger that external flash via the built-in flash. However, when I use it, The photo appears really washed out. How do I reduce the power output of the built-in flash?

I have a friend who uses a Nikon and his built-in flash's power output can be changed
 
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