You will probably need help with your RS game. If were on iOS, and going to IOS device, then try logging into the game center to see if you can find your RS game.
If you are coming off or going to an android device, you will need to contact support for assistance.
To log back into Game Center, please follow these instructions on your device:
1. Device Settings (little silver cog icon on your device)
2. scroll all the way down to Game Center
3. tap Game Center and login where it says Apple ID.
4. Restart the game.