Firmware update and admin password

> Model: R6700|Nighthawk AC1750 Smart WiFi Router

   R6700[v1], R6700v2, or R6700v3?  Look for "Model" on the product
label.

> [...] I entered the word password. It didn't work. [...]

   Apparently, someone changed the password from its default value.

> [...] Then I clicked on the link to follow the steps to reset it and
> the link didn't work. [...]

   I don't know what that "the link" might have been, or what those "the
steps" were, or what happened when it "didn't work".

   If you don't know the password, and Netgear's unreliable password
recovery procedure fails, then the remaining option is to reset the
router's settings (which include that password).

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.
Look for "Factory Settings" and/or "Reset button".