Multiple pc’s on one network

I need help better understanding how to connect my laptop to a wireless ‘network’. Im a novice with wireless technology.
So we have a home desktop pc, cable internet connection and I just bought a laptop and bought a Netgear router to connect everything together.
So, I was able to connect teh desktop to the router and the desktop can still access the internet. Also able to get the laptop to wirelessly recognize the router. Thats where my brain stops adding value…
I cannot log ontothe internet. When I click on explorer, I just get a page not found message.

Anybody out there that can tell me whats wrong? Please!!!