Welcome to TPG Community!
We appreciate your query however, changing of your network name or WI-Fi name is not possible to be done interstate. It would require that you are connected either via wired (LAN connection) or Wi-Fi to the modem/router.
We'd be happy to assist you on this once you're in the premise. Just kindly let us know here or you may contact our support at 13 14 23 (options 2 + 2) alternatively for assistance.