Step 1 Open the web browser and type tplinklogin.net or the IP address of the device (default is 192.168.0.1 except TL-WR1043ND V1 is 192.168.1.1) in the address bar. Press Enter.
Step 2 Type the username and password in the login page, the default username and password both are admin, Then click Login to log into the device.
Step 3 Click on System Tools->Password on the left side, then you can change the router’s username and password on this page.
Step 4 Click Save, then system will prompt you to log in the page by your new username and password.
Note: Do not forget the new username and password. If you forgot them, you need to reset the router to factory default setting.