Connect cable modem to wireless router for wifi connection

I am currently with Virgin Broadband and am trying to connect their cable modem to a wireless router (Dynamode BR-6004 W-G1) and am struggling.

I have read many posts and tried various things and know that there should be an easy way to do this.

All I want to do is connect a laptop wifi.

Do I plug the cable modem into the WAN port? Do I have to power them up and connect them in a specific way?
Any help would be greatly appreciated!