In the Files
section menu, click on the folder under which the new file/folder will
be placed. In the toolbar click New.
A New...
dialog appears. Choose if you want to upload a new file or create a new
folder.
If you decide to upload a new file
you need to click on the Browse...
button, locate the file on the disk and click OK.
If you decide to create a new folder
you need to enter its name and click OK.