This is a handy link to help set up SSH keys for working with github.

https://help.github.com/articles/generating-ssh-keys

Below are some of the commands:

ls -al ~/.ssh
ssh-keygen -t rsa -C "your_email@example.com"
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_rsa
pbcopy < ~/.ssh/id_rsa.pub

After pbcopy, just head over to Github Account Settings to add your SSH key.