Netgear R6300v2 router, where is the 8 digit PIN# found?

PIN>>>> No #                            

either on the bottom/back, or you need to login to the router to see it in settings.

usually it is something you set up before using.

It sounds like you are trying to use WPS to connect your laptop.  You can find the router's WPS PIN at ADVANCED > Advanced Setup > Wireless Settings.

But you don't necessarily need to use the PIN.  If your laptop supports the push button method of WPS, you can use that instead.  Push the WPS button on the router, then start the WPS join process on your laptop within two minutes

Up you bhole.