Give us screenshot from router STATUS. What kind connection do you have from ISP?

Perhaps you can plug the computer into the modem and make sure the modem is working properly with the computer. after that, reset the router and reconfigure to see whether it will work or not.

okey,so I made some printscreens,uploading them.
Yes,the modem is woking just fine.

Why do you configure PPPOE as router's WAN connection?
I guess you are using an ADSL modem. So when you computer is hooked up with your modem directly, do you need to dial up with your username and password on the PC to access internet?
If yes, using PPPOE as WAN connection is correct. You may check if you have correctly entered the username and password provided by ISP.
If you don't need to dial up on the PC, you need to configure Dynamic IP as WAN connection. And make sure the LAN IP of router is in different IP range as your ADSL modem. For example, if your ADSL modem router uses 192.168.1.1, do change the tplink router LAN IP to 192.168.2.1.