You would like to link the commits to a github repository to your github account but you may have different git accounts (ie gitolite etc).
So you would need to specify in the config file which account you want to use.
There is a help page in github that describes this problem here, but they recommend to change your global settings which is maybe not what you want.
So you could the following to change only the current project settings:
cd ~/my_project git config --local user.email="your_github_account_email"
Or add the following to your .git/config file inside your local repository:
[user] email = firstname.lastname@example.org name = Firstname Surname
And to check the settings:
git config --local -l git config --global -l