How to raise rear headrests?

The only issue which is vexing me is that I can't figure out how to adjust the rear headrests. I'm beginning to wonder if it's even possible since it's a cabriolet? All I'm trying to do is raise them an inch so I can fit straps around the metal brackets for a seat protector for my dog. But I haven't found anything in the manual to describe how to do it.
Thanks in advance for any guidance!
It doesn't tell me how to adjust the height of the rear headrests.
I'll gladly post this question where it makes more sense...can you tell me where?
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