You may want to go to a car parts store, or book store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
In most cases you will need to replace the turn signal switch on the steering wheel for your 1983 Chevy Caprice Classic rather than fixing it. To replace it, remove the horn pad and then use a steering wheel puller and compressor to remove the steering column. You will then remove the signal along with the wiring harness and bus fuses. Replace the signal and wiring and then replace the steering column itself.