Netgear C7000v2 - PIN or Network Security Key

> [...] I need the PIN [...]

   I doubt it, but, with my weak psychic powers, I know nothing about
your (unspecified) "my printer", or who told you to do what.

> [...] or the Network Security Key [...]

   Also known as the "wireless-network passphrase"?

   Are you following some set of non-secret instructions?

> [...] for my Netgear C7000vs router [...]

   "C7000v2"?

> [...] Where is it located on the device? [...]

   Here's a radical concept which some people find informative:

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

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.
Look for "PIN"?  I'd guess that you want the one in the "Specify WPS
Settings" section, not the one in the "Use the WPS Wizard for WiFi
Connections" section.  Or, for the passphrase, "Specify Basic WiFi
Settings".  Further reading might not hurt, either.

   But I'd also guess that there are alternative ways to configure your
(unspecified) "my printer" which don't require you to know any PIN or
passphrase.  Look for "WPS" in the instructions for both devices?