You can open the GNOME Menu in the following ways:
From a panel with a GNOME Menu
Click on the GNOME Menu.
Use shortcut keys
You can use shortcut keys to open the GNOME Menu. When you use shortcut keys to open the GNOME Menu, the GNOME Menu appears at the mouse pointer.
The default shortcut keys to open the GNOME Menu are Alt + F1. To change the shortcut keys that open the GNOME Menu, choose Applications -> Desktop Preferences -> Keyboard Shortcuts.