It should be pretty obvious. Just show him how it's configured for "master"
https://github.com/TrinityCore/TrinityCore/blob/master/src/server/bnetserver/bnetserver.conf.dist#L76
Rather than complain, then show both options.
Not to bump this, but figured out how to set the timer. Now I need to set it to cast a spell if the timer runs out. During testing, however, the timer counted down to 4 seconds, then the spell vanished...
If you do not give more details of what you intend to do we can not help you.
If you want to connect the client to a server on your own pc you must follow all the steps of the wiki.