Your garbage disposer has to be replaced.
As a replacement option I would recommend the 1/2 H.P. continuous feed with quick-lock mounting and galvanized steel grinder garbage disposer made by the Whirlpool.
It has the same design as a very good known In Sink Erator garbage disposer and cost about 25 bucks less.
It comes with the complete, step by step installation instructions.
- The part number for the Whirlpool garbage disposer is
AP3121409
Good luck.
Gene.