How do I install Monit? (beginner)

Hi,
I followed this guide for installing Spree with Ansible (http://guides.spreecommerce.com/developer/ansible-ubuntu.html)
I want to monitor the app with Monit. how do I use the recipe in the library to install it?

Here is my fork of the repo:
https://github.com/gaaady/ansible-rails-app

Thanks
Gady