You need to amend the commit (press commit and then choose amend from the commit options above the commit message).
Afterwards, you need to force push to the server, because you are rewriting history. You cannot do this with SourceTree and the server might also stop you from doing it, because it is a potentially destructive operation.
Yes, and if other users have pulled your changes, their workflow will be disrupted as well. Stackoverflow already has information on how they can recover. Please make sure to read both answers to that question: http://stackoverflow.com/questions/6898317/git-pull-analogous-to-opposite-of-git-push-f
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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