How do i fix my cub cadet riding lawnmower?

set it in fire

Jerry, very common problem you just need to open the hood and allow a garden hose to run on the engine and accessories for an extended period of time.

Take it to a dealer or small engine shop. You gave us no indication of what the problem is.

Now that would depend on what the problem is! If you don't know, then take it to a 'small engine mechanic'.