IBM 704 - Manual (Page 285)

Using the Utility Programs
To access the File Editor:
1. Select File Editor from the Utilities Menu; then, press Enter.
2. Insert a diskette into drive A or drive B before selecting the file
that you want to edit; then, select the file from the Files
Selection box.
3. Press Enter.
4. Make your changes.
5. When you are done, press F10 to update the file with the
changes that you made, or press Esc to quit the editing process
without saving the changes.
Note: When you are using the File Editor, you can press F1 to
display all of the available keyboard functions.
Chapter 5. Solving Problems 267