MR60

Look at the Installation guide online to setup your system.

There's a support site with access to manuals, firmware, install guides, etc.
Go to https://www.netgear.com/support/
Type in your model number and from there it'll take you to the above.
Its a great resource to start with.

Are you trying to make separate ssid's or combine them? 

Here's how to make them separate. 

https://kb.netgear.com/000063027/Can-I-create-separate-2-4GHz-and-5GHz-SSIDs-on-my-Nighthawk-Mesh-WiFi-6-products