My 2006 kia optima will not shift into drive. Its making a humming noise.

Have you performed testing that indicated the transmission range sensor was not reading as it should be? If you have a proper diagnostic tool that can monitor components, you'll be able to see commands and actions taken by components co comply with those commands from the transmission. Of course, make sure your fluid is clean and full. https://repairpal.com/repair-shops/kia-repair-and-service-in-paducah-kentucky