Anyone know how to factory reset computer when forgot password

Ronkonkoma NY

Description

picked up a dell, says model # 99VMRW1, at thrift shop, but when turned on needs password...wasn't sure how to factory reset, this screen is only thing get to with f12, other f keys dont do anything, as most videos show f10, f4, etc... if anyone may be familiar, just wanna factory reset since used dont need anything left on it..thanks