'Merge New Local Android Studio Branch into Github Branch

I re-installed my Windows10 OS and installed the latest update of Android studio. I then opened a stored zip file of my project into Android Studio. I created a lot of changes and now want to upload these changes to the existing project on Github. But if I try to "Share project to Github" it tells me that the project already exists. I already know that. What I want to do is to merge this as a branch to the project that already exists. How do I do this?



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