Need access to router settings

> I have an N300 WiFi router.

   "N300" is a speed, not a model number.  Ever helpful, Netgear product
packaging emphasizes speeds like "Nxxx", but that's not the model
identifier.  Look at the product label.

> Model: C3000|N300 Cable Gateway Docsis 3.0

   "C3000" is a model number.

> [...] When I go to routerlogin.net, it just shows me that I'm
> connected and what my password is.  It doesn't show me any settings.

   If you don't already have the appropriate user manual, then visit
http://netgear.com/support , put in your (actual) model number, and look
for Documentation.  Get the User Manual.  Read.

   If what you see in the User Manual differs greatly from what you see
in real life, then your ISP might have artificially limited what your
router can do.  You can try resetting it (Look for "Factory Default
Settings" in the User Manual) but a cable ISP has almost complete
control over the firmware in such a router.