Al,
Ok, i see your confusion,
I am not sure why the program is crashing on the PI so here is where the file is in Linux
when you login in you should be in your home directory
if you type: cd .d-rats
(change directory to .d-rats)
it is a hidden directory. In linux when you create a directory that starts with a . (period) is will remain hidden.
so once in there, you shoud be able to edit the users.txt file as explained in the docs.
use nano or some other text editor. you can use? /home/cody/.d-rats/user.txt as the full path if you wish.
substitute your username for mine of course.
Maybe this will help get you where you need to be.
I have not used it yet, but was thinking if trying out d-rats for local comms.. what kind of setup do you use for your emergency comms ?
Thanks
Cody