Code update:

git commit -a -m 'Some reason for code change'
git push -u origin master

--

Pull repo on new machine:

git clone https://github.com/samboy/MaraDNS

--

Have permission to push repo on new machine:

git remote set-url origin ssh://git@github.com/samboy/MaraDNS.git

[Replace this with your github username, and make sure to add your
 ssh key to your github account as per the instructions at
 https://help.github.com/articles/generating-ssh-keys ]