How to Add a Trendline With Excel 2007

1. Select the chart to which you want to add the trendline. Click once on the data series for which you want the trendline to appear.
2. Click the 'Add Trendline' option on the 'Chart' menu. This action will open a separate pop up window.
3. Click the 'Type' tab. Select the type of trendline that you want to add from the list of available options. Click the 'OK' button to add the trendline to the chart.