If you are a Facebook user and have linked your account to Facebook to invite friends, simply connect to Facebook again and you will be automatically logged in to your account, and your previous games and any purchased stops will be retrieved.
Please refer to this page for more details:
http://powgi.freshdesk.com/solution/articles/1000121995-can-i-play-my-games-on-two
If you are not a Facebook user, contact us for further assistance.