How is router setting?

Who can help me? I was told that I should stop the router because I have 2 lines. A slow and a fast yet I do not know how. Already have looked on the Internet but found nothing. I'm most difficult only with the Xbox One in the network and the Resiever connected to the router. What do I have to do to set the router?

So you can configure IP based router.

https://www.wlansignalverstaerken.de/router-ip

There are all the IP addresses to call the settings for the router

Is there a browser installed in your XBox? Since you can then enter the IP and have a look.

Which IP address? Where do I get it from? * What is it? * Sry

Oh sorry. Unfortunately, my answer was not so helpful.