You can create a new repository on your personal account or any organization account where you have sufficient permissions.
- In your user bar at the top right of any page, click the "Create a New Repo" button
- Select the account you wish to create the repository on
- Enter a name, select to make the repository either public or private and click "Create repository"
Tip: If you don't have Owner or Admin rights in the organization, you'll be notified of an "insufficient permission" in the list.