How can I make Events+ Confirmation to WORK? =)

I just purchased and tried different ways to install and make this to work. Its a beautiful app and concept. BUT the confirmation it's not working, we've tried different themes, activating plugins de-activating plugins and nothing, looks good, and does 2/3 of what we need, but the most important part it doesn't do. The confirmation (Attending/Maybe and Not Attending) it's not showing. What do I need to change?
http://www.maisamigo.org/events/2013/06/esporte-futebol/