I'm trying to create a copper fill and send it off for print, but I'm having trouble making the copper fill work. As I understand it's something to do with Net names. I don't have a dc power source. I'm trying to create a hub dynamo usb charger. What is the purpose of Nets and should I fix my naming or maybe there is a work around?
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
when you set the keep island as Yes. you will see the copper
https://easyeda.com/Doc/Tutorial/PCB.htm#Copper-Area