Dryer Cycle Selection Knob Not Working

My Whirlpool Duet Electric Dryer’s Cycle Selection Knob Is Not Working. When I Turn The Knob There Is No Resistance And No Matter What Cycle It Rests On, Only The Delicate Cycle Lights Up. The Dryer Does Run, But Of Course Not Long Enough For Most Loads. Is This Something We Can Repair Ourselves Or Do I Need To Call A Technician? We Are On A Limited Budget, But Are Very Handy With The Right Instruction. Thanks!