TP-Link WAP

1. Connect laptop to Lan port of WAP router
2. Change IP of WAN router to 192.168.1.11, Reboot
3. Change SSID to same as Main Router
4. Change Channel to other side of spectrum
5. Set to WPA2 and same password as Main Router
6. Disable DHCP, reboot
7. Connect to main router LAN port

http://www.tp-link.com/en/FAQ-417.html