On 30 Jan 2022, Oli said the following...
 
 Ol> pi@raspberrypi:~ $ ls -l /etc/jamnntpd.*
 Ol> -rw-rw-r-- 1 root ftn  521 Oct  4  2019 /etc/jamnntpd.allow
 Ol> -rw-r--r-- 1 root ftn  170 Jan  9 11:04 /etc/jamnntpd.config
 Ol> -rw-rw-r-- 1 root ftn 3634 Jan 27 11:45 /etc/jamnntpd.groups
 Ol> -rw-rw-r-- 1 root ftn 1200 Oct 25  2019 /etc/jamnntpd.users
 Ol> -rw-rw-r-- 1 root ftn 2854 Sep 15 14:05 /etc/jamnntpd.xlat

Thanks! Files are there, was able to edit the config.

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--- Mystic BBS v1.12 A47 2021/12/25 (macOS/64)