How do you set the clock on a 1993 Pontiac Bonneville?

By looking for the instructions in your owner's manual, or just figuring it out. Don't have an owner's manual. You can probably go to any salvage yard and get one. Also a google Search will yield results.

Press and hold the hour button until it starts blinking, about 3 to 5 seconds. you should now be able to keep pressing the button until it reaches the desired number, do the same for the minutes button, then leave them alone for about 5 seconds and it should be set. If that doesn't work, good luck to you.

The car itself has to be turned off.