[Theme Horse Support Team]

Hi Jörg,
Our theme is not woocommerce compatible and you may have to edit and create new files for this to make it compatible. Just adding some code will not work and possibly will break other pages. So we request you to hire someone who is capable of making such changes.
For more refrence
http://docs.woothemes.com/document/third-party-custom-theme-compatibility/

Thank you!