I installed sourcetree, connected to my git repo, and was able to successfully clone, branch, push, etc. I then changed my git username (it wasn't very professional!) and now I can't use sourcetree at all. It asks me for the password for my old username, and I can't find a way to change that field.
EDIT: I'm using OSX
I had the same problem, and it was very difficult to find. As far as I can tell, for Mac Sourcetree, this is the ONLY way to get to these settings:
Screen Shot 2015-11-16 at 10.18.05 AM.png
Hope that helps!
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