Solution: Warning: Cannot modify header information - headers already sent by...
This error message has nothing to do with the product but could be a general Wordpress installation problem and you can find a solution for it at the Wordpress FAQs page at
http://faq.wordpress.net/view.php?p=7Summary: You should check the file name/s in the error messages for blanks AFTER the last php code and remove all blanks before you save and upload the file/s again.