how can i run soapUI after I edited its sourcecode?

I want to see how the  soapUI gui is implemented. idid not find any specific gui code on github.

I want:

1.  change & edit code of soapUI
2.  build it, run it
3. see the changes.

how do I do step 2? Do I need to :

compile, build & run the installer again?

and only then see the changes?

in general, how do I quickly see the changes that I made? soapUI is desktop application, after every change it must be reinstalled right?

pls tell me how to do it.