[SOLVED] Change WiFi After Initial Setup - Want to give to a friend

[eracerr]

I've setup a Rasberry Pi zero W with Allo Mini Boss for my dad.  I will be mailing it to him.  I want to be able to provide instructions on how to set it up when he receives it.  I've set it up and tested it on my WiFi and created a few stations that he wants but are not in the library.   How can I tell him to log into the system to change the WiFi to his IP and password?   After initial setup I no longer see the Pi showing up on the WiFi, so I can't tell him to connect to it directly unless there is another way to do it.

Thanks for the help!

Eric