MAC:

$ git config --global user.name "John Doe"
$ git config --global user.email "bob@example.com"

Change the user name password in keychain

Windows:

1. In your terminal, navigate to the repo you want to make the changes in.
2. Executegit config --listto check current username & email in your local repo.
3. Change username & email as desired. Make it a global change or specific to the local repo:
   git config [--global] user.name "Full Name"
git config [--global] user.email "email@address.com"
4. Per repo basis you could also edit.git/config manually instead.