You find your router's settings by logging in to its web-based configuration utility. You do this by entering your router's IP address in a web browser's address box and then entering the appropriate user name and password on the router log in page.
You will find your router's default IP address, default user name, and default password in your router's User Guide.
If you provide the make and model of your router, someone can read the User Guide for you.
If you explain what settings you are looking for, someone can tell you where in the router's configuration utility to look for them.