Basement fininshings/baseboard on metal framing?

Hi all,

My basement has drywall over metal framing and i wish to place baseboards, but am not sure how to properly sucure them to metal?

the metal was tapcon'd to the cement floor. what's the best way?

do i simply use a compressor and hammer nails through the verticle studs (every 16") or is using screws the only way?

thanks for your help