95 drain plugs

I have a 95 Chevy Silverado 1500 and I want to change the antifreeze in it. The repair manual says it has 2 drain plugs. I see the one on the radiator. Where is the other one and does it look like the one on the radiator?

Pull off the bottom radiator hose, I have had a lot of problem with old plastic plugs... a lot of times they will leak, or break...leaving u to fend for a new radiator... because the platic tanks suck!

On each side of the block there are plugs to drain the block. on the passenger side there is a knock sensor, on the driver's side there it just a pipe plug.