There are many ways to rename a file in Mac OS X. It seems that the easiest way is not necessarily well known, since I regularly find myself sharing the following information. Simply click on a file or folder icon in the Finder, then press the Return key. The file or folder’s name will be highlighted when you press the Return key. Simply type in a new name and then press the Return key a second time to indicate that you’re finished renaming. That’s it.