Hi,
There is a status page in the menu on the left side. Check if your asus got an IP address by your other router, because a successful wireless connection doesn't also mean that your asus got an ip from your other router automatically. If it does not, then you can try to connect by clicking the "connect" button (automatic IP should be chosen in lan config and on your other router DHCP must be enabled for this to work) If it doesn't work, then chose a static IP in the lan configuration on your asus and deactivate dhcp on the other one and restart. And most importantly both routers should be in the same subnet (for example 255.255.255.0) and their ip must be different (example router1:192.168.2.1, example router2:192.168.3.1)
Have fun!
dp79