Please follow the instructions in http://www.tersus.com/#Id=5585.
To ensure you're not sufferring from bugs which have already been fixed, please make sure you're using the latest studio version (currently 2.0.11) - see http://www.tersus.com/#Id=239 for further instructions (you'll want to specify the latest rather than the stable update site).
The phonebook application is not a mobile application and therefore has no <Mobile View>. I recommend you checkout the mobile tutorials (see menu on the left-side of http://www.tersus.com/#Id=5088).
If you still find that export does not work, please provide additional details, such as log files (look for export-log.txt in the application's root folder) and screenshots.
For best results, use the Firefox browser..