Congrats for making it this far!
As far as copying files to a system folder, you need to be root to do this. The way most Linux people do it is with the cp command. For more on this enter this.
Code:
> cp --help
or
> man cp
(enter q to exit man)
It seems simple enough, but I can never get the syntax right! So what I do is to start the file manager from the terminal (as root). I think Ubuntu uses Nautilus, so you would enter this.
Enter your password and a Nautilus window will open up. You should now be able to copy and then rename the files.