I have a Linksys WRT150N

Question

I have a Linksys WRT150N router and Comcast HS intrnet. I am trying to set the router up but can't get my iMac to recognize the internet connection between the router and computer. I have reset the router to default setting. The router shows that it is receiving the internet connection but the computer doesn't. How do I get my Mac to recognize and connect through the router?