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.
The LAN IP changes by model. Please find it on the bottom label of the product.
Type the username and password in the login page. They are both admin by default.
Select Network->LAN on the left side, and then change the IP address according to your request.
Click Save button to save the settings，then the router will reboot itself.
Note: After changing the IP address, you need to type the new IP address of the router into the web browser to log into the router.