How do you replace the radio and insert a cd player?

Hi, pull the trim plate off the dash around the radio. The trim may go all around the instrument panel. With the trim plate off, you can see the factory radio screws. Take the screws out, pull the radio out and remove the connectors, including the antenna wire.
You will need an adapter to fit the aftermarket radio snugly into the dash. They sell these wherever they sell aftermarket radios. I recommend you also buy the cable adapter. If you don't, at least buy the antenna adapter of you will no be able to plug your antenna into the new CD player.
Follow the instructions on putting the adapter together--it's made for a lot of different cars. You need it to screw into your dash where the screws came out.
If you buy the wire adapter, follow the directions that come with it. I recommend you solder the wires, but you can use those crimp connectors if you don't have soldering equipment.
If you don't buy the adapter cable, use the factory wire colors below to match up the aftermarket wires to your factory wires. Wrap any solder connections with electrical tape and carefully plug everything back in, including the antenna adapter and antenna cable. With the adapter plate attached to the new player, carefully push the wiring aside to get the player into the slot and then screw it in. check the system for proper operation and then replace the trim panel.
Enjoy your CDs, and let me know if you have any questions.

2002 Chevrolet Silverado C1500 Radio Wiring Instructions
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Pink
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Super Easy! Go buy a 'wiring harness' (walmart or any other car stereo place) and some electrical tape. If you are going from a 'double din' to a single (most silverados have a double din) you will need a 'mounting kit' available at the same places. You pry gently the plastic piece (surrounds the instrument cluster to the other side of the radio) a flat screwdriver works great, and it pops out. There may be two screws on either side of the old radio or there may not be. Our truck doesn't have screws it just has a clip on either side that we pushed down and the old radio just slid out. Connect the same color wires from the wiring harness to the new radio and twist them together and wrap them in electrical tape. When you have it all connected, follow the instructions on installing the mounting kit and you shouldn't have any problems. The wiring harness should directly plug into the original plug for the radio, the hardest part should be plugging the antenna wire back in. If you have any problems with it feel free to email me [email protected]. Good Luck!