I presume you are trying to increase your WiFi range.... Mr. Google is your friend in connecting a second router. It isn't so difficult, but you have to hardwire the routers together and there are a few specific settings that need to be on the "slave" router. For seamless access throughout your home, I believe both routers will need to have the same identical SSID and connection characteristics.
As others have mentioned, there are other ways to extend range, without adding a second router, but if you already have a second router, it's doable. It's not a difficult process.
Good luck....
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