Click on the project folder and enter username/password to login.
To upload a file, fill in the file name in the "File" field or click on "Browse" to select a file, then click "upload" to upload. * File name cannot contain space character(s)*.
To download, either use "shift-click" (Netscape) or "right-click --> Save Target As" (IE) on the filename. "shift-click" means "press down and hold the Shift key then do the mouse click".