Where do I need to sign?
FIR-ma-re — three syllables, stress on the first.
When the receptionist presents you with a registration form. All Italian hotels require guests to sign a registration card.
'Dove devo firmare' uses 'dovere' (must/to have to) + infinitive. 'Firmare' means to sign. The registration card ('scheda di registrazione') is a legal document that hotels are required to collect and file.
Cosa devo compilare?
What do I need to fill in?
Ask when handed a paper registration form
Posso usare il mio indirizzo di casa?
Can I use my home address?
Yes — hotels need your permanent address for the registration form
Può spiegare cosa firmo?
Can you explain what I am signing?
Perfectly reasonable to ask before signing any document
The hotel registration form in Italy is called a 'scheda di ospitalità' (hospitality card). Hotels transmit this data electronically to the local police (Polizia di Stato or Carabinieri). It is a routine administrative process, not a security concern.