To add a widget, long press an empty space on your Android 'desktop' and select 'Widgets'. You will then be presented with a full list of Widgets. Simply select 'WorldMate' from the list.
WorldMate’s widget will not appear on the widgets list if WorldMate is not installed on your device’s internal memory (but on an external memory card).
On your device please go to: Settings ->Applications -> Manage applications ->Select WorldMate ->Move to phone -> then restart your device to apply changes.
After doing so, you will be able to see the widget in the widgets list and add it to your Android's home screen.