This is what I did:
- Download the zip
- Unzip it in root/packages
- Go to Dashboard > Add Functionality
- Install
- Go to Dashboard > Reports > Piwik iframe

Then a text with instructions show up:
"To install tracking code you just need to cut and paste the
javascript tag given to you during your Piwik install and placed it in the box located in your Concrete5 Dashboard under System & Settings>SEO & Statistics>Tracking Codes"

Pardon? "javascript tag given to ME during the install"?? What are you talking about?? All I got during the installation was a confirmation message saying the installation was complete!!

Please help :[