How to run GitHub ApkRename step by step

A

AC Question

I want to do answer #3 on this page which promises a 5 minute execute:
"android.stackexchange.com/questions/19935/how-to-keep-two-versions-of-an-app-installed"

I have all the software. I have never used Git Hub. All I want to do is run ApkRename and ApkSign. I can't get the GitHub interfaces to work. Where do I enter the data the answer requires? I can get the dos screen to flash but the file is not opened on the phone even in the manager app. Also is a new file created? If so where? Anyone know about this?