@Mitavittua123
Hi,
Beside the TL-WR841N, do you have any other devices available that you could connect via Ethernet cable directly to the wall outlet in your apartment in order to verify the Internet connection is working? (for example a computer with LAN port)
As for the TL-WR841N. Have you already done some configuration on the router itself or is it still the way it came out of the box?
I suggest you connect via a computer, phone or tablet to your TL-WR841N and then log into the router's web GUI (usually via http://tplinkwifi.net) and once you have logged in click "Quick Setup" in the menu on the left side. During the Quick Setup process choose "Wireless Router" as operation mode and in the next screen select "Auto-Detect" as the WAN connection type. Then click "Next" and wait what the router comes up with.