Can access Internet but not home network via new router

You have the cable from the switch going into the Asus router's WAN port right? That's creating a separate subnet behind the Asus router. So stuff connected to your Asus router and stuff connected to your Superhub router are literally on different networks. You need to (1) assign the Asus router a static IP address, (2) disable DHCP, and (3) connect it via a LAN port.

1a. Login to the Superhub. Find its DHCP IP address allocation range. It's probably something like 192.168.1.2 - 192.168.1.254. You need to change this to something like 192.168.1.100 - 192.168.1.254. This means the router will only give out dynamic IP address ranging from 192.168.1.100 to 192.168.1.254. Anything in the 192.168.1.2 to 99 range can be used for static (manually assigned) IP addresses., since the router will never automatically give those numbers out to devices asking for a dynamic IP.

1b. Login to the Asus router. Find its LAN settings (not WAN settings). Give it a static IP in the 192.168.1.2-99 range. 192.168.1.2 is a good choice if it's not already taken. (I also assign devices like printers and file servers static IPs, but it's up to you.)

1c. Disconnect the cable from the switch to the Asus router. Reboot the Asus router. Connect your computer to it via a LAN port or wifi and confirm that you can login to the Asus router via 192.168.1.2 (or whatever number you used).

2. Login to the Asus router again. Find the DHCP server settings. Disable DHCP. Reboot the router. This prevents both the Superhub and Asus from handing out dynamic IP addresses, creating conflicts and all sorts of other weird problems.

3. Connect a cable from the switch to a LAN port of the Asus router. Take a piece of tape and cover up the WAN port so nobody accidentally plugs anything into it.

When all this is done, the Asus router will basically be a wireless access point on the Superhub's network. Strictly speaking, only steps 2 and 3 are necessary. But you need to do 1 if you want to be able to reconfigure the Asus router in the future (in your particular case, if you want to change it's wifi settings).