I suggest to connect via ethernet to the router

And try to access: 192.168.1.1 / on your web browser

Alternatively you can use:

http://tplinklogin.net/

default admin and password login is: admin

If this does not work it's because its needed to access router from different URL

hope it works

for more info about your router and instuctions just access the manual pdf which can help you: https://static.tp-link.com/res/down/doc/TL-WR841N_free netflix accounts_V9_UG.pdf

The address may be 192.168.0.1 instead of 192.168.1.1

thanks for community helper

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Here I am explaining some steps 

I hope you like it

1. Make sure your computer is connected to the Internet. ...
2. Open a web browser. ...
3. Enter 192.168.1.1 into your browser's address bar. ...
4. Enter the router's username and password. ...
5. Click Wireless. ...
6. Click Wireless Security. ...
7. Scroll down and check the WPA-PSK/WPA2-PSK box. ...
8. Type in a new password.

For More Information https://static.tp-link.com/res/down/doc/TL-WR841NFree Netflix Account_V9_UG.pdf

@Naresh 

Thanks for the help!

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@Naresh Hi, You can change your TP-Link wifi router password very easily. Just follow the bellow steps.

Step 1:- Open web browser and type LAN IP address of the wireless ADSL router in the address bar, and press Enter. The default IP address of TP-Link ADSL router is 192.168.1.1.

Step 2:-Type the username and password in the login page. The default username and password are both admin in lowercase.

Step 3:-Click Management->Access Control->Password on left page, and type the old password and new password.

Step 4:- Click Save/Apply to save the settings.

Thanks & Regards,

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