Install it like any other DMG file.
Once the application is installed run it. A login screen will be displayed. Use your login info. You can logout at any moment and login to a new account if you wish.
Select an empty folder in your local computer and sync it to the public folder in your account so that you can paste there files that you want to share with your team.
You can watch some videos to find how to get maximum advantages from the service.
Link a local folder with a remote folder
Share from private folder to shared folder.