reTerminal user keys - hot to use them?

I have looked and can’t find any information on using the 4 user keys on reTerminal. AKA - in the Wiki “User Buttons x4”

How can I access and use them?

Thank you

@Baozhu pls advice :innocent:

@Bee there you go

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Just thought I could add to this a little bit. The codes that are needed in the last line of the /boot/config.txt file are “keyboard v-scan keycodes”. That wasn’t obvious to me at first. Google search should return a few pages that list them all.

IE:
0x013 = r
0x014 = t
0x015 = y