In order to access your Github you need to do it via ssh. So you need to add your ssh public key to github. After that you are able to access github via ssh i.e.:

 git init [email protected]:yourname/yourrepo.git


See also: [Github: generating ssh keys][1], [WikiHow][2]


[1]: https://help.github.com/articles/generating-ssh-keys
[2]: http://www.wikihow.com/Add-Ssh-Public-Keys-on-Github