To change the Wi-Fi connection password Turn on the modem and open a browser (for example, Explorer, Chrome, Firefox, Safari, Edge), type http://192.168.15.1 in the address bar and press the ENTER key on the keyboard. Enter as "admin" username and as "admin" password and click the Login button.
Because this modem can operate the Wireless connection on two radio bands, you can choose which bandwidth you want to enable/disable the Wi-Fi connection.
Change the connection password for the Wi-Fi 2.4GHz network
In the Security section, type the new password in the text field corresponding to the Key Pass Phrase entry.
Click the Apply button to activate the new password.
Note: The modem will restart automatically after clicking on the Apply button. When the modem restarts, the Wireless network turns off for about 10 seconds.
Change the connection password for the Wi-Fi 5GHz network
Repeat the same procedure in the WiFi 5GHz section to change the Wi-Fi 5GHz Wi-Fi password.