Currently, the only place to find questions that were submitted by viewers of an on-demand webinar is on the report for that on-demand webinar. There should be a notification system instead. Maybe each individual question gets sent in real-time by e-mail to the account admin (or whatever email address you want to assign) so that questions can be answered as soon as possible. Otherwise, you have to constantly check reports to see if any questions have come in. If you have a lot of on-demand webinars, this is terribly tedious and impractical.