R6100 Wifi Router, invalid IP address per windows

My router will not connect wirelessly and when I try to troubleshoot it on my computer it says that my router as an invalid IP address. I just got my modem working and am trying to get my router going, the wireless will not work so I follow the setup instructions and connect the eternet cable from the router to my computer. When go to www.routerlogin.net the message says "

You are not connected to your Router’s WiFi network. To access routerlogin.net, your device must be connected to your Router’s WiFi network. Check your current connection and try again." 

Someone please help this momma out, moving with two kids and no netflix is killing me. Please explain things to me in laymans terms. I am not very tech savy.