Renaming files can be done in Finder or from within the program.

1. Select the file in Finder and choose "Rename" from Finder's File menu.
2. Enter the new name for the file, then press Return.

1. With the file that you want to rename open in the program, click on the name of the file at the very top center of the window to be shown a popover for the file's name and location.
2. Enter the new name for the file, then press Return.