@Boyinterrupted 

When the extender is factory defaulted it will broadcast the default wireless network which has the name TP_Link in it.

Plugin the device, do not connect anything to it, and wait a couple of minutes. Use your smartphone to see the available wireless networks. If the default name comes up, you can then set up the extender.

If you want to use the extender like an access point, you can not set it up like a range extender, then plug in a cable after. The device must be changed to AP mode: https://www.tp-link.com/us/support/faq/1401/

@Tony 

Thanks for your response.

I have created a network (mynetwork_EXT) but when i try to connect to it, it says "internet not available". 

I also have tried to log in to the extender http://tplinkrepeater.net , using the instructions given but it can't connect with mynetwork_EXT. 

thoughts?

@Boyinterrupted 

Look at the LED lights, and reference that of the quick installation guide, you can visit the product support page a well. See if the LED lights indicate it is connected to the router. Another way is to log into your main router and see if the extender shows up as a connected client. 

If not, then the wireless password is provided to the extender during setup may not be correct, as the wireless password needs to be the same password you would use to connect to the main router via Wi-Fi.

During this set up I would recommend having the extender in the same room as the main router to rule out any issue with distance.