R6080

> [...] Are there instructions for setting up my R6080 as a second
> router?

   That might depend on exactly what "as a second router" means to you.
"second" to what?  Why?  One possibility:

      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.  Look for
"Use the Router as a WiFi Access Point Only".