Apply a 'Plug in' a Module into Magento

I have bought a 'plug in' module and this plug in needs coding into my Magento.
I need to ensure that the code is installed correctly. The module's author has instructions and are as follows:

http://www.flinttechnology.co.uk/media/cms/FEEFOInstallandoperationinformation2012.pdf

Disable Magento compilation function
● Place the zip/tar file on the server
● Unpack and copy the files into the root of the Magento installation
● Verify the module is in place in the Magento back office screens
● If the installation is not showing then clear the cache
● Re-enable the Magento compilation functionality

Once the module is installed it will be configurable under System>Configuration>Sales>

Make any necessary CSS changes to change the look of the feedback panel on product page and TEST,TEST,TEST.