Moving folders around is very simple!
To move a folder, first navigate to the folder by clicking on it from within the Materials section.
Next, click on the area shown here.
Using the drop-down menu, you can choose which folder you want your selected folder to be a part of, including the Resource Center. If you want to move a folder out into the main section, simply select the blank field in the drop-down menu, located at the top. Don't forget to hit Update when you're finished!