The window summarises the campaign: Recipients (unique phone numbers after exclusions), Total Cost (recipients × message parts × rate), Balance After, the Groups and Excluded groups with their counts, the Message with its number of parts, the Scheduled time and the balance calculation. A tip reminds you that shortkey expansion varies per customer, so keep about 20% extra balance. CONFIRM only appears when everything is valid and the balance covers the cost. Otherwise you see one of: No SMS Number Selected, Empty Message, No Schedule Defined, Send Time Error (the time is in the past), No Recipients (the selected groups have no users), or Insufficient balance with top-up buttons.