How do you change the wiper arm for a 2005 Kia Sedona?

If it is for the rear wiper then you would pop the cap off at the base of the wiper arm. You will see a nut which should be a 13mm. Loosen the nut and pull up on the wiper arm to stand up. Do a little wiggle and it should pop up to realign the wiper arm if it is positioned too low or too high. To completely remove then just unscrew the nut and in the stand up position pull off.

The basic approach applies to the front wiper arms but looks like you would have to pop open the hood first.

Good luck.