Go to ACP->Templates & Style->Templates-> *Chose Your Theme Template* ->Post Bit Templates Now, find "Postibt_Classic" and open it. Copy all content from there and close it. Now Find "Postbit" and paste content you are copied (Postbit_Classic content)
Done!
Important: It does not matter what is checked in your panel ("Display posts using the horizontal post layout" or "Display posts using the classic layout") this will work anyway!