Changing your FPT’s Wifi password or name is possibly done at home. You can follow the instruction steps in the clip below
https://fpt.vn/en/personal/support/technical-support/setting-guides
Notes:
If you know little about the technique, please connect your computer and modem directly to the LAN port when changing your wifi password and/or name.
If the modem interface fails to show up upon entering the IP address 192.168.1.1, please change to another browser or computer as your computer may be off from some services and/or connection methods. In case of a company LAN, please ask a IT staff for help.
If failing to enter your username/password, please call our technical support immediately, do not arbitrarily reset the modem.
Once changing wifi name or password is completed, you should sign out from the former wifi connection and log in the wifi once again.
If you possibly connect the wifi but no network is available, while other computers are successfully connected, go to Manager Wireless Networks in the Control Panel Home, delete all the wifi names previously remembered, then search for your wifi name and log in.