Add Legend

Ribbon bar. Select the Insert tab. In the Legend group, click Stats to display the Add Legend dialog box.

Classic menus. On the Insert menu, select Statistics to display the Add Legend dialog box.

Note: this dialog box is also displayed after you have selected statistics on the various Statistics dialog boxes when you have clicked the Statistics button in the Graph Options dialog box.
Type
Use the Type box to specify whether the statistics are added as movable (Floating) or fixed [Fixed (title)] text.  
Position
Use the Position box to specify the placement of the statistics. If you have selected a Floating type, you can choose from Left-up, Left-down, Right-up, or Right-down. If you have selected to add the statistics to a Fixed (title) position, you can select from one of the five default title positions: Title, Subtitle, Footnote, Left, or Right.
OK
Click the OK button after you have made your selections to display the appropriate Statistics dialog box or to return to the Graph Options dialog box.
Cancel
Click the Cancel button to return to the graph or the Graph Options dialog box, disregarding any changes you have made in the Add Legend dialog box.
Note: When the number of values in a legend exceeds the space for the legend, select the legend to display a slider that you can use to navigate through the legend list.