NETGEAR Model C6300 AC1750 Cable Modem Router just want to login to my GENIE.....cannot

I bought my current Modem Router in June of 2015---still working awesome for residential internet. 

I used to easily log-in to the Smart Wizard Genie to view my router data/information---------now, using the same log-in I used to use (http://routerlogin.net), it wont let me log in............I tried downloading the Nighthawk app but, it says that does not support my product. 

HELP----I am on my own network--------HOW DO I LOG in to my admin/Genie for my network today (6-8-22). It has been a while since I logged-in..........Thanks for help!!