Unable to log into http://192.168.100.1 because "Your connection to this site is not private"

> How do I tell my web browser to let me continue using the "not
> private" connection? [...]

   I'd assume that there's some option/control/button on the page
(pop-up?) with the "not private" complaint.  (Or just ignore it?)

> [...] where in Chrome's setting [...]

   I don't know if there's a global setting; I'd expect a per-site
choice.  I seldom use Chrome.  In Firefox (Mac, at least, but I believe
Windows, too), it seems to remember a previous choice.  I go straight
into my D7000, but it does show a lock icon with a red slash through it
(roll-over text: "Connection is not secure").

   Around here, the "Sign in" box on Chrome says, "Your connection to
this site is not private", but, when I put in the correct credentials,
it works as expected.  (With "/!\ Not Secure" before the URL.)  Whether
I've already been down this path with Chrome on this Mac is uncertain.

> [...] It's that pesky http://192.168.100.1 that I can't get to. [...]

   What happens when you try?

   "can't" is not a useful problem description.  It does not say what
you did.  It does not say what happened when you did it.  As usual,
showing actual actions (commands) with their actual results (error
messages, LED indicators, ...) can be more helpful than vague
descriptions or interpretations.

> By the way, my PC remains hard wired to the modem (Netgear CM1200) via
> an ethernet cable. [...]

   That's probably bad.  With typical residential service, you get one
external IP address, so you get to connect _one_ device to your modem,
not more.  That one device would typically be your router (WAN/Internet
port), and all your client devices would be connected to that router
(LAN ports).  If you connect multiple devices to a modem, it's likely
that only one will get a useful Internet connection (and your
external/public IP address).  If your computer is not getting a valid IP
configuration (address, et c.), then not getting through to
"192.168.100.1" is the least of your problems.

   The CM1200 User Manual is less emphatic than it should be about the
limitations/restrictions on the use of this modem's multiple Ethernet
ports, but there are some hints.  For example:

      Note: Your cable modem comes with a plug that covers the LAN 2, 3,
      and 4 ports.  You can remove the plug to connect a router that
      supports Ethernet port aggregation.  For more information, see the
      cable modem's user manual.

   You must, I claim, admire the the quality of documentation which
tells you to read the manual which you are already reading.

> [...] And, I'm still concerned about that message, "Your connection to
> this site is not private". [...]

   Get over it.

> Exactly. That's the kind of thing Netgear users, like myself, want to
> prevent.

   Which part of "already" was unclear?

> [...] are you employed by Netgear [...]

   No.  Netgear employees have an "N" icon by their names.

> [...] or are you a knowledgable user [...]

   Opinions on that vary widely.