[ZD1200]How to set the redirect start page when using Web authentication

[long_lin]

Hi there,

A zd1205 version 10.4.1, I enable the web authentication to the wlan , not use wispr. After I finished the authentication on the captive portal, it redirected to a blank page with the word "null".

I just want to know how to set the  new URL after user is authenticated, I can't find the option.