First of all, click “Add new module” at modules tab on back office. You will find it in the top right. After that, select packaged file you have downloaded and click “Upload file”. Now your module appears on modules list. Click on “Install”, and “Configure” next.

 

You can also unload .zip file and upload it into your modules directory. In this way you will install and configure module from modules admin.

It is necessary to add a hook on the category page. In the user guide you can see the hook and the file you need to modify of your active theme.