First of all this is their problem not yours. They are supposed to give all the information needed so as to keep good candidates to go through their process. So it should not concern you. At this point whatever you do does not really matter in the sense that if the interviewers approved you, you will get a call for the next step and you will get a chance to ask your questions. If they have rejected you you won't get any meaningful response anyway. In case you decide to ask anyway (which as explained is of no benefit to you at this point) then send the email to the person that arranged the interview instead of the interviewers. Unless the interviewers told you it is fine if you contacted them.