Step 1
Open the web browser and in the address bar type in: http://192.168.1.1 or http://192.168.0.1 or http://tplinklogin.net.Then press Enter.
Note:
The LAN IP changes by model. Please find it on the bottom label of the product.
Step 2
Type the username and password in the login page. They are both admin by default.
Step 3
Select System Tools->Password on the left side to open the configuration page.
Step 4
Type the old and the new username/password, then click Save.
Note: Do not forget the new username and password. If you forgot them, you need to reset the router to factory default setting.