Press the ALT key to display all ALT key shortcut options. Shortcuts are represented by underlined letters in the menu bar.
After pressing ALT, use shortcuts by pressing the appropriate keys. When your cursor is positioned on the drop-down menu, you can use your arrow keys to move vertically and horizontally through menu options. When your cursor is positioned on a vertical drop-down menu, you can choose a shortcut within that menu by typing the underlined character.