Can’t log in c6300

What error are you getting? 

How are you attempting it? 

Details help more than "can't log in"

 

As plemans says, not enough to go on there.

 

But the C6300 is a cable modem/router. Not the same thing as a Nighthawk WiFi Router.

 

You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

Cable Modems & Routers

In the meantime you could visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware. Look at the label on the device for the model number.

You may have done this already. I can't tell from your message.

I mention it because Netgear stopped supplying printed manuals and CD versions some years ago and people sometimes miss the downloads.