This thread might help you:
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You need to connect the TP-link router to the modem, and have Auto Configuration - DHCP in TP-link Router.
Your modem page should be 192.168.1.1
and your tp link router will be 192.168.0.1
Go to your browser and make sure that your TP-Link (192.168.0.1) has Auto Configuration - DHCP (will be under basic settings). In this way, TP-link will behave like a PC obtaining an IP Address automatically.
TP-Link will automatically get an IP from your modem. You also need to enable DHCP in TP link router so that the PC's can obtain an ip address automatically from the TP Link router.
Make sure to insert a password (key phrase) (WPA2), to protect your router/WiFi from any intruder. This will also be available in your router page (192.168.0.1) under 'wireless' settings.