to elaborate on hippo's reply:
in Re^5: perl in the stars you said:

git remote add origin https://gitlab.com/perlmonks/betelgeuse.git
[download]

There are two ways to pull from your repository:

• HTTPS - which uses the same username and password as their web interface, and is usually read only/pull only
• (implicit) SSH, which uses an URL starting with git@gitlab.com: instead of https://gitlab.com/ and uses the SSH certificate you uploaded on the setup page

(similiar for other git services)

By the way, is the "perlmonks" part in your URL real? This would imply your user name there is "perlmonks", since the URLs usually are "username/repo-name.git". If you look at your repo in the web interface, there is a (blue) button "Clone" above the file list, which should show you both URLs for HTTPS and SSH.