Make certain the ISP had already provided DSL Broadband Service (PPPoE) to you.
Please connect the router to the computer which used to connect directly to your modem.
Only use the Ethernet port on the modem. If you were using the USB connection before using the router, disconnect the USB cable and connect an Ethernet cable to the WAN port of the router.
Make certain that you had disabled or uninstalled other third part PPPoE dialing up software such as WinPoet, Broadjump, or Enternet 300 from your computer, otherwise you will not be able to connect to the Internet. Some ISPs also provide similar PPPoE dialing up software.http://www.tp-link.us/article/?faqid=86