Here is an excellent source for pi-star setup for Apple users. Most can be applied to windows as well.
Step by step the calibration process is shown in great detail.
From the Preface to the article:
This article attempts to provide comprehensive steps on setting up the MMDVM for Digital Mobile Radio (DMR).
However, this article is focused on using Mac OS X to do so.
There are number of articles on-line that provide instruction on setting up RaspberryPi images and the MMDVM board from Windows.
Areas that are Mac OS X centric include flashing the Pi-Star image, locating the MMDVM IP address and the use of Terminal to access the MMDVM via Secure SHell (SSH).
The content in this document assumes that the MMDVM is being operated within the United States of America and under Code of Federal Regulations Title 47, Part 97.