> Then I used macOS to start slip, and then booted muli 
> user and it worked!!  So now I can go to another terminal and telnet into 
> my machine.

Cool!  To solve your problem, I think you can use the installer to copy
the files out of the filesystem, edit them with Alpha or some such
editor, and put them back.  Specifically, you need to copy out
/etc/master.passwd (passwd doesn't have password information in it).
In /etc/master.passwd, you can just delete the encrypted password for
root.  Then, after copying the file back in (look out for CR/NL-types of
translation), you should have an unpassworded root account.

Then, boot multi-user, slipped up, and login as root.  Then use passwd
to change your password...  For adding new accounts, use the vipw
program to edit master.passwd.

-allen


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