I don't see opencore when booting usb

Hello everyone one... I'm trying again to make my own Hackintoch. I've done everything following the instructions, but when i'm trying to boot the computer on my usb key i have the following choices, but nothing about opencore.. does anyone would what i have to do?

Itstucklikethis https://imgur.com/gallery/G0CoVNh

Thank you.

submitted by /u/Own-Particular8316
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