My new printer wants my Encryption key - where do I find that?

What is that printer? What Netgear device are you trying to connect it to?

 

Is that over wifi, Ethernet or USB?

 

The usual way to fix wifi printers is to find the printer maker's utility, the software that runs on your operating system. Then use that to connect the printer to the wifi.

 

The router just broadcasts wifi. It is then down to the printer to play ball.

 

Where possible, using the WPS feature can simplify things.