1. After creating your chart, RIGHT mouse click on your chart
2. Select Source Data from the list of options
3. Click on the Series tab
4. Under the Series window box, you will see the X and Y axis (or the column headings)
    under the word Series.  Make sure you can see both your chart and the window box. Click on
    the column option you want to change. Notice the Values area may change properties listed.
5. Click on the spreadsheet where the information you want to have listed is. Notice the
    little railroad looking tracks are around the data, press ENTER. This should update your
    headings as appropriate.