To Switch from Facebook account to Guest account.
- Tap 'Gear icon' > Tap 'Log Out' option
- Tap 'Log Out' option on pop-up > Tap 'Play as Guest' option on pop-up
To Switch from Guest account to Facebook account.
- Tap 'Gear icon' > Tap 'Log In' option
- Tap 'Connect' option on pop-up > Tap 'No Thanks' option on pop-up
- Tap 'Play with Friends' option.
- Key-in your Facebook account Login credentials.
Note: Make sure that you are logged/logging into the right Facebook account.