The menu button
To access CalenGoo’s menu, you have to tap the menu button of your phone. On Android 2.x devices, the menu button is a hardware button. Your phone should have four buttons: “Back”, “Menu”, “Search”, “Home”:
The order of the buttons may be different on your phone. To open CalenGoo’s menu just tap the “Menu” button.
Android 4.0 devices have no hardware buttons. Instead they have a menu button on the screen, a button with three dots:
Just tap it to open CalenGoo’s menu.
Exceptions
At least one device (HTC One V) doesn’t have this three-dots menu button. Instead you have to press and hold the “Recent apps” button to open the menu, as explained here: