The Alt key plus an assigned letter key is used to open and navigate menus. When the Alt key is pressed and either held or released, the first letters in the menu titles are underlined. Then, when the underlined letter key is pressed, the menu opens. After a menu opens, additional underlined letters can be used to select a menu item. Alternatively, you can use the arrow keys to move within the menu.
To access submenu items after opening a menu:
To move to the menu item, press the Down arrow key.
To open the submenu, press the Right arrow key.
To move to the submenu item, press the Down arrow key.
To select the item, press the Enter key.
The Esc key progressively steps up the hierarchy of menu selections and then defeats the Alt key mode.