Opencore USB not detected in F12 boot menu or BIOS

I have an Intel i5-8250u(Kaby Lake-R),8GB 2400 MHz RAM,Acer Aspire 5 A515-51G,I followed this guide https://dortania.github.io/OpenCore-Install-Guide/ and Chris Titus Tech's guide for visual representation. I did everything properly and now when I try to install from my USB,it doesn't appear in the boot menu or BIOS. Can someone please help me? This is my first time installing Mac OS so I might have made some mistakes.

submitted by /u/Smoke4121
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