Making UI Changes in QGC

Hey everyone,
So I am working on a project for which i need to make some changes in the UI for QGC. I am a Windows user so I am having a lot of trouble setting up the repo and running it in my system. Can someone guide me on how i can make the changes? Also using QTCreator is not an option for me as my trial has expired for that. Also i would really appreciate some resources so that I can get to know the repo to make the necessary UI changes