Please note that you need to configure your remote repository to use SSH rather than HTTPS. As a corollary, you need to make sure you have an SSH key set up for accessing your repo. See here if you don’t know how to do this.
Also, if you configured your remote to use HTTPS, see here about how to switch the URL to SSH.
Bonus: for GitHub users, you can run
ssh firstname.lastname@example.org, which is kind of fun .