please help, I need to use my router for wifi connections but it has rj11 port and my internet cable is rj45

[nk3]

Please kindly help, I bought a router (for wifi connection use) but it has Rj11 port and my
internet cable is RJ45. How can I use the router because I cannot return it anymore from where I bought it

 

[Alabalcho]

What you have is DSL modem/router combo. You need router only, and you cannot use yours for that.