How can I return to use OSX (Yosemite) after installing Windows 8.1?

How can I return to use OSX (Yosemite) after installing Windows 8.1?
I cannot find Boot Camp on my iMac (late 2013) with windows installed. So I downloaded it, but I cannot run it because of an error (x64...). I tried to use my USB stick with bootcamp installed but nothing. When I turn my iMac on it starts automatically with windows. I tried to search it, but I found only the setup and it doesn't work. How can I get back to my APPLE iMac? How can I use OSX?
Excuse me for the (maybe) uncorrect language, I speak Italian.

Hello!
You can start your Mac up with the [alt] (sometimes [option]) key pressed and you will get the Startup Manager.

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