Swiss International Airlines - zurich transfer advice please

tomorrow we are flying Edinbrgh - Zurich - Boston. The Edinburgh Zurich flight is on BMI and then on SWISS (in F if that makes any difference). Have been told by BMI that our luggage will be routed through to Boston but that we will need to collect our SWISS boarding cards in Zurich - question - is there a transfer desk in arrivals or do we have to go landside and check in?
Any guidance much appreciated.

Just go to the F lounge (it is outside of security, upstairs close to the first A security). You can get your BP there.