Hello from France , I would like to know how to program an extra
remote in a Blazer S 10 1993 ? Thanks for your help

My books don't go back that far. This works for the 95 which should be the same.

Drop the underdash. there are 3 -7mm holding it up. Right next to the parking brake mounted on the underdash pane is a module. This is you keyless entry module.

Ground the black wire with the white stripe wire

The doors will lock then unlock, and the hatch should pop

press lock on each remote one at a time

The doors should lock/ unlock to confirm the remote(s)

Remove ground from black/white wire.