Edit UI of 3D slicer

I have built 3D slicer from the source using Visual Studio 2019, I want to work to edit the UI. Instead of Load DICOM, I intend to edit it to load CT sequence images and later edit the method as well. to I am a beginner please advise on how to edit the UI using Qt.

Take a look at Slicelets: Documentation/Nightly/Developers/Slicelets - Slicer Wiki