How do i change break rotors on a 1988 chevy blazer(big blaze) 4x4.?

do i need to take off the thing that says free and lock?How do i change break rotors on a 1988 chevy blazer(big blaze) 4x4.?
take off the tire, look behind the caliper and take out 2 blolts should be with a allen wrench put aside not to put any strain on the brake line, now take off the center cap with a flat head screw driver , remove the cotter pin and unscrew the big nut and tap on the back of the rotor, its really very simple,