are you saying that you want to make your "let me play" team into a fb account team? then do the following:

1) logon to your facebook account using the Facebook app.
2) Start the game app and log into your team using LET ME PLAY.
3) go to the farthest right and chose FRIENDS icon
4) click on LOGIN WITH FACEBOOK
5) done. Your "LET ME PLAY"-team has now been linked with your FB account. Only one team per account though!