It's possible that the application needs to be configured before you can add any maps or the maps you are trying to add are not compatible with the application. Either way, re-install the application and then access the Settings and Help menu to see exactly what is the procedure to add maps. It's known that on Android, map applications require extra configuration before they can work normally. Additionally, browse the application page for the app and contact the developer. It's also possible that the installed application to have compatibility issues with your device.