It isn't a problem at all. Question 10 asks for an address where you will live if known and if you don't know you can simply write "To be decided". You can update that at the interview.
Question 11 is about where they will send the Green Card - that is a more important issue. You need an address of somewhere that is safe to send your GC once it is ready. THat can be a friend, family member, a lawyer - whoever you can trust to receive the Green Cards for you. Have a think about how you will do that. Again - it is not important if you don't know yet - but you do need to let them know at the interview ideally.