Turn off and unplug PC and then open the side panel.
Remove CMOS battery
Hold power button for 20 seconds.
Plug in PC and turn it on.
Turn it off when you see a message regarding settings.
Replace CMOS battery and side panel.
Turn on PC and enter BIOS(delete key). Apply any needed changes.
If I Google your question I see this
https://www.lifewire.com/how-to-clear-cmos-2624545