From your project, click on the "Settings" tab.

Provide a title and code for your new project.

Then select "Duplicate". This generates your new project and it will be in the same account as the original project.

Navigate to the account which now contains both projects, by clicking on the account title in the breadcrumbs at the top of you screen.

You will see the new, duplicated project at the top of your list. Click "View" to then manage your new project.

Understanding how to duplicate a project