How to boot without USB a macOS installed through OpenCore?

I have successfully installed macOS Sonoma on my 12.5' Late 2013 iMac via OpenCore. Now I'd like to boot without USB. According to this page I need to "Install OpenCore to internal drive". How can I go about doing it? I need detailed, step-by-step instructions for dummies, please.

submitted by /u/dodli
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