The complete instruction on Github
Create a key in the default location without any passphrase (or add one if you like). Then add it to the ssh-agent.
ssh-keygen -t rsa -b 4096 -C "[email protected]" ssh-add ~/.ssh/id_rsa
Copy the key into the clipboard
Go into your profile and select SSH and GPG keys, click Add SSH key, add a description and paste the key.