The menu system lists the shortcut key for a command on the right side of the menu. Shortcut keys can also be displayed in the ScreenTips. When you enable this option, you'll see the shortcut key for a command when you hold the mouse pointer over a toolbar button.
Click on Tools. The Tools menu will appear.
Click on Customize. The Customize dialog box will open.
Click on the Options tab if it is not selected when the dialog box opens. The Options tab will come to the front.
Click in the Show ScreenTips on toolbars check box, if it is not selected. A check will be placed in the check box.
Click in the Show shortcut keys in ScreenTips check box. A check will be placed in the check box.
Click on Close. The dialog box will close.
Hold the mouse pointer over a toolbar button. If a shortcut key is assigned to the command, it will appear in the ScreenTip.