Once you complete your solution, you should send it back to Codebie. Since you've already cloned the repository in the first place, it should be set as remote. If you haven't altered the git settings, you can directly run the command below:
git push origin master
Since you can only push once, please be careful before doing so. The company will be notified after your push, allowing them to start your solution.
Note: You can work in any branch on your local computer, but the solution must be pushed to the master branch. Otherwise, your push will be rejected!