XAR40 Wireless conection issues

I connected my new router with the Ethernet cable to my modem and when I try to go the internet it doesn’t work , this is the second I’m getting because the first one it said that the Ethernet cable wasn’t connected . And now I have all green lights but still hasn’t be able to connect to the internet. I already rebooted the router I don’t know if it’s the modem that is not comptable or something. I have internet because I connected it to my laptop using the cable and the problem is the WiFi .
Thank you