Setting Clock on 1993 Chevy z71

I recently bought a 93 Chevy Z71 Cheyenne edition pickup, but with out the manual. The clock on the dashboard is way off, but I can't figure out how change the time. Does anyone know how, or know a way I can find out how. Thanks!

Push set button. Set will come on on the radio. Then use the seek and scan buttons to change the hour and minute. You can only go up.

Thanks alot