I need help with Eagle CAD how do you edit silk screen how to add copper to the empty spaces
To import images as silkscreen (or any layer), use File->Run... and then choose import-bmp.ulp The image needs to be in BMP format. I'd recommend using a blank board to do this until you're sure it's correct, then doing a copy/paste into your actual board or better into a library instance.

To generate copper fill, use polygons. Use the Name command to assign them to the net you need.