Hi Micro,

I was directed by netgear support (via email) to login via http://www.routerlogin.net . Not very helpful as it went to the screen as noted in your Q1 .

I was using my pc as the netgear is right next to my laptop. I also tried the nighthawk app on my phone but could not find to get into to make adjustments to the 2,4ghz and 5ghz setting in the email from netgear:

Below are the following links:
Change channel: 2,4 GHz to 1/6/11, and 5GHz to the highest number

https://kb.netgear.com/23783/Improving-2-4Ghz-Wireless-Performance-by-Changing-Channel

Please see my comments to your questions below

What is this "Netgear screen"? 

NETGEAR Router Login

Learn how to configure your router by choosing a path below.

Where do you get it? from JB Hifi

Where are you trying to log in? Browser/Nighthawk app? at home next to my netgear.

Hope that helps.