My e-mail is
tanthai@sbcglobal.net
I appreciate if you could give me a detail procedure how to set it up.
Thanks and best regards.
TAN
info on setting up remote access is here
https://support.plex.tv/hc/en-us/articles/200484543-Enabling-Remote-Access-for-a-Server
and here
https://support.plex.tv/hc/en-us/articles/200931138
we are not going to have specifics on the Portforwarding set up in whatever model/brand your router is