Simply put, Finch is a Python script that communicates with Jenkins. It helps you stay in the CLI environment while running Jenkins tasks to improve workflow. Currently it's catered to Prowl.
If you're a Prowl employee, you need login to the Prowl VPS, and then clone the repo via
git clone http://www.github.com/Montana/finch.git
Once Finch is cloned, you can run Finch by running
python finch.py
You may need to chmod first, but that should be the ONLY thing you have to do.