TP-LINK Router problem

I want to go to internet in my whole house without cables.
I have TP-LINK TL-WR741ND model. In the easy user assisant guide thingy , it says all i have to do and i do it,and it says what should be flashing and what should be on and its all perfect, my http://192.168.1.1 works too,BUT when i want to go check internet connection with the easy user assistant guide too,it says network cable is unplugged,but all is perfect working like it should and http://192.168.1.1 is working too. Help?