Order up from the Express Menu with this simple shortcut: To access a menu while you are working in Photoshop or Elements, press the Alt (Mac: Opt) key. Look in the Menu Bar. One letter of each menu is now underlined (usually first letter.)
Press that letter to activate the menu.
So Alt I (Mac: Opt F) opens the Image menu and Alt E (Mac: Opt E) opens the Edit menu.
You can access the menus this way without ever moving your mouse!