You can find the default IP address of your router in the router manual and also on a sticker at the back of your router. Usually the address is 192.168.1.1 for accessing router IP. You can log in and configure the router.
Steps to access router settings
Connect your router and computer through an Ethernet cable.
Open a web browser and type the IP address. This will direct you to the login page of the router.
Enter the log in credentials in the boxes mentioned, enter the default credentials if you haven’t changed them.
Now, go to the settings and make the changes according to your requirements.