need help with booting

so im making a dell optiplex 7010 Hackintosh, and i configure the bios, and make the usb boot drive, and its not showing up in bios. does anyone know what i can do??

btw this is the guide that im following: https://www.Tonymacx86/threads/...plex-7010-9010-desktop-pc-revision-ii.251736/