Remote Shack with Expert Remote 

'all-in-one-place' practical setup guide
Step 3. Installing opnSense onto Mini-PC.
3.1 Before poweing on, plug keyboard, USB bootable drive and monitor into Mini-PC

3.2 Power Mini-PC on, and enter into BIOS by quickly pressing several times [ESC] or [DEL] button on the keyboard right after power is on and before it starts booting anywhere. (Note: [ESC] or [DEL] is the most often option, but it can be also [F2], [F10] or [F12] - dependent on model and manufacturer).

3.3 In BIOS find Boot section and select the only bootable option from USB.
Save and exit from BIOS - this should restart the Mini-PC

3.4 Now wait till Mini-PC will be booted into opnSense installer - do not press anything on keyboard until you see this screen:

3.5 Use login installer with password opnsense

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