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First, create a new SSH key and link it to the new GitHub account you want to use. When prompted to choose the file, change it to another different than the default one. Remember to give a full path, otherwise it will be created on the current directory. This is the process for this step: https://help.github.com/articles/generating-ssh-keys/
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Add the hosts on /Users/dev/.ssh/config. If the file doesn't exist, create it. Example:
Host github.com-anabellaspinelli HostName github.com
User git