How do you replace the front turn signal bulb located on a 1993 Chevy Beretta?

It's a total pain in the ass! You have to lay down on the ground and reach up behind the inside of the bumper / spoiler / fascia (whatever you want to call it), and feel around for the plastic twist-grommet bulb-holder. Twist it 20 degrees counterclockwise (as though you were looking out through the lens) and withdraw the bulb-holder from the inside of the lens body. The wires should be long enough that replacing the bulb is a snap. But reaching up in there... well, you gotta have long, skinny arms and nimble fingers.