After you login, there is a "Facebook" button... users connect their FB account to FPCurator by clicking on that button .
The "Facebook" button will connect to the account that the users are currently logged in to Facebook... so if you want to switch to a different Facebook account then you have to go to facebook.com, logout and login with your other account.. then, try login to fpcurator.com and connect to Facebook again
1. logout from FB
2. login to fpcurator.com
3. connect to FB with the Facebook account of your choice