Renaming files and folders in Mac OS X is quite easy, but it may not be that obvious, especially if you are new to Mac.
Here is how to rename files and folders in Mac OS X
In case you were a Windows user for a long time, probably the first think that you’ll try is to right click on the file and select “Rename” from the list.
However, this option doesn’t exist in OS X. Instead, simply select the file and press Return (Enter) on your keyboard.
The name should become editable. After you’ve entered the desired name, hit Return again, and you’re done.
Alternatively, you can right-click on the file/folder, choose “Get Info,” and change the name under the “Name & Extension” panel.