Here you can manage your Pinball Arcade Account. If you don't have one, feel free to sign up. An account lets you record your highscores, view them online, share them with friends, and receive optional newsletters.
* PSN (Playstation Network, i.e. PS4,PS3,PSVita) users are not able to login through this interface at this time, although PSN user's scores are included in the online leaderboards.