Hi, Gerrard.
The default password of logging to the web management interface.
You can obtain the default username and password on the product nameplate, as the following figure show:

Changing the Password of the Login Account
Enter the IP address in the browser address bar and press "Enter". In the "Login" window, input "Username" and "Password" according to the product nameplate.
Click the System Tools tab and then choose Modify Login Password from the navigation tree. In the right pane, change the password of the user.
NOTE:
1. If the default password for this device has been changed. In this case, you need to:
2.The device is customized by the ISP. In this case, contact the ISP to obtain the corresponding solution.
3.The device password varies to regions. Contact the local device provider and service agent.
Thanks.