how to fix a 1993 grand prix door handle opens from inside can;t open from the outside
You need a new one, those were terrible door handles, broke all the time.
You can get them for about 20 bucks.
You can get them off e-bay for cheap, here's one for the right side, and flat black, not sure if yours is gloss or flat black. Or you can get them from GM or an autoparts store, don't know how much they'd charge though.
I need a passanger one myself one of these days, mine's just bent though, so I'm in no rush.
... or go to a wreckers to get one.