i dont suggest loging into the GUI as root unless you know EXACTLY what you are doing, because you can screw up ALOT in you system if you accidentaly do something to an important file. With all cautions aside and you knowing the risks of your actions, all you do is login to the comuter as root using 'root' as the username and the the root password. This can be done in either the GUI version of the login or from the command prompt, If you do it form the command prompt you will have to use the 'startx' command after you log in. If It were me I would open up a commmand window
#cd [directiry with the files to be copied]
#cp [file name] [directory to be placed in]
repeat the cp command as manytimes as needed.
That is what i would do
Hope that helps