can a person pay the taxes on a property without the owners permission? How do I get this undone?

This is a very unusual thing.  In most states (I would have though all states), the payment of someone else's taxes would yield the payor no benefits -- it would amount to a gift to the owner of the property.  Does Kentucky have some peculiar law that somehow allows the payor to gain some advantage?  You should confer with a good real estate lawyer in your area for an answer.  It would be worth a modest conference fee to learn whether you have been disadvantaged in any way because of the payment.  I cannot imagine how you could have been disadvantaged.