Hi there, friend!
1. Click the Network Application tab and then choose Portal Configuration from the navigation tree. In the right pane, enable/disable the portal function and set the redirection URL addresses for different types of devices, as shown in the attached picture
2. Click Apply.
If the type of the device that you use is not configured with a URL address or the device type cannot be identified, the system redirects to the default URL address upon the first access to the Internet.