Calendar not letting me set the rates

hi, my calendar is showing Closed for all non-confirmed dates. I think this may be because I clicked delete on the standard base rate on a page which I think was linked to the Rates and Calendar page. I can't find my way back to this page - or is there some other way in which i set this standard base rate? I've tried filling this in on the calendar, both in blocks and in individual days. I've set the rate at £120 per night and clicked on Open but it's just showing as £0. Can someone help, please? Stephanie