New and need help

I have bought a used Atomic Zipper. The original owner put on turf tires, but did not calibrate the speedometer to match the smaller tires. Any help would be greatly appreciated.

The Villages Florida

Most likely it will need to be done by dealer. Do you know what motor control it uses?

Thank you. I talked to the previous owner that told me he changed from street to turf tires after buying so that is most likely the reason for the speedometer to give the wrong MPH and record more miles than actually traveled. I can live with that until next annual service if I can’t figure it out on my own.
Now, I have studied till I’m dizzy trying to change the HOME address in the Navigation from the previous owner to my address.

Anyone know how to program that navigation?

I went to the dealer and he had no idea how to fix this problem.