It should have come with a Allen wrench. Be sure it is off. Insert it in the bottom into the center hole. Move it back and forth several times until it frees up. Remove wrench and try, you may have to do this several times. Also be sure the unit is reset before turning on. If it does nothing nor makes nay noise it is probably tripped.
If you buy a similar model from the same manufacturer, you can leave the sink fittings in place. Unplug the power and disconnect the waste pipe. Undo the bayonet fitting securing the waste disposal unit to the sink fitting. Fit new unit to sink fitting, reconnect waste pipe and power. Run the unit with plenty of water to check for leaks. Job done.
TURN OFF POWER before sticking your hand in.!!
But first check the reset button underneath the unit. Also, try to rotate the spinner with hex key usually provided.
Drink beer and then recycle glass bottle or aluminum can
Then research recycling route for all recycled and non-recycled waste products If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7