Did I miss something? No stats appearing

I’m new to Joomla so I’m not sure I understand all of the requirments for Piwik to work. I do know that I have the required php version, I’m just unsure of the Required extensions: PDO, pdo_mysql, zlib, SPL.

I have installed Piwik but no data appears. The date continues to update, but no data appears. Can someone please help???

http://piwik.org/faq/troubleshooting/#faq_58