AC1750 no coaxial connection?

> I'm trying to connect [...]

   Is this a new installation, or a change to some existing (working?)
installation?

> [...] my cable and Internet [...] my wall coaxial ports [...] This
> router I bought [...] my local service [...]

   The non-psychics in your audience might know very little about any of
those things.

   Because you've mentioned "coaxial", I'd guess that you get your
(unspecified) "my local service" from some cable-TV-type ISP, in which
case, you might need some kind of cable-TV-type modem.

   With my weak psychic powers, I have no idea what you have for gizmos
or infrastructure.

   If Netgear made your (unspecified) "This router I bought", then you
might find some relevant information in a widely neglected resource:

      https://en.wikipedia.org/wiki/RTFM

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual (at least).  Read.

   If questions or problems remain, then you might return here with more
than the slightest trace of useful information.