How do I add a new device to my AX6600 Nighthawk Router?

[Backhoe409]

I have new new computer and i need to add it to my Nighthawk AX6600 router. I have the phone app by do not have the knowledge to add this computer to it. 

I can not see my network site come up on the computer screen when i search for my network. I can see all of my neighbors but not mine.

Looking for help.

Thanks

[plemans]

what computer is it? 

What wireless chipset is in the computer? 

What driver is installed for the wireless card?