Moonfruit will automatically take your annue fee from your bank but they will NOT automatically renew your domain. If you dont renew on-time you will lose your website and emails plus the emails settings. You will then have to pay a higher price to renew your domain and then waste time setting up the emails again.
The other problem with Moonfruit is NO telephone line to call. You will have to email them and await your reply. Not good if your website and email are down!