Create an Trac account

SSH into the Crin1 server and run:

sudo -i
su - trac -s /bin/bash
export NEWUSER="username"
htdigest .htpasswd trac $NEWUSER

And if they need admim permissions also run:

trac-admin /var/www/trac permission add $NEWUSER admin
trac-admin /var/www/trac permission add $NEWUSER TRAC_ADMIN

Then login as the user and set their email address at https://trac.crin.org.archived.website/trac/prefs