R6400v2 I forgot my password for WiFi. Have a Apple IPad. I’m desperate. Trying to connect printer.

You can always log into the router (with a device already connected). Then just log into it so you can view/change the ssid/password. 

https://kb.netgear.com/23439/How-do-I-change-my-NETGEAR-router-s-WiFi-password-or-network-name-SSID