> First of all , connect your Second router with the computer using an ethernet cable(make sure cable should be connected to the LAN Port of the router)
> Now open the login page of the router and after that change the local ip address of the router
For Example:- If your first router's local ip address is 192.168.1.1 and DHCP Range is 2 to 100
Then Second router's local ip address is 192.168.1.101
> then you need to disable the dhcp pool in the second router
> you can also create new wifi network profile and new wifi password and save the settings.
> Now Connect you Second router with the First router using an ethernet cable and connection should be LAN to LAN. (lan port of the first router to the lan port of the second router)
> Cascading Done.