bumper has either 4 bolts/2screws or 2 bolts/2screws

scerws are located either side of the bumper at the wheelarch. usually rusted, drill the heads off

bolts are on the front pannel 1 or 2 on either side. you just need to remove the nuts as the bolts are captive on the bumpers, bit of a squeeze but easiest is usually with the front jacked up slightly or might be able to get at them from the engine bay squirt liberally qwith WD half hour before doing it, will make life easier.