How do I label a series in an Excel line graph?
Right-click the chart with the data series you want to rename, and click Select Data. In the Select Data Source dialog box, under Legend Entries (Series), select the data series, and click Edit. In the Series name box, type the name you want to use.
How do you select a data series in a chart?
Right-click your chart, and then choose Select Data. In the Legend Entries (Series) box, click the series you want to change. Click Edit, make your changes, and click OK.