When initially setting up a WiFi extender you need to have it and your laptop plugged in as near as possible to the wireless router so you can go through the setup process without excessive wireless range/distance being an issue, and everything required for the setup (laptop, router & extender) can all be seen at the same time in the same room
Please note that the above is merely a temporary arrangement to assist in getting it set up properly.
When the setup process is complete and the extender lights show everything connected okay, you can then move it to a more suitable position in your house, somewhere midway between the router and the furthest point in your home that you need to access the internet from.
Keep an...