If you need to lower it, there should be a small release lever on the side of where it is mounted. It has been some time since I've seen one and there isn't any specifics in my manual.
However, I found a pic of one in a Chrysler and attached it below. I circled the release button/lever to lower the headrest. Check to see if there is one similar to that on your vehicle.
Let me know. If you don't find it, I'll keep looking.
See pic below.
Image (Click to make bigger)
Friday, August 27th, 2021 AT 9:39 PM