Fuel pressure regulator is located on the fuel rail (which supplies the injectors w/fuel) on the drivers side of the engine.
Take off the plastic cover on top of the engine, find the fuel rail, trace it to the rear of the engine on the drivers side. The fuel pressure reg. sits in a cup(about 1-3/16" diam.), held in place by a snap-ring & has vacuum hose connected to it on top & a fuel line coming out of the bottom.
You would have to remove the vac. line, then the snap ring (inner), then the innards of the FPR...Re-assemble w/ new innards in reverse order.