If your flight was canceled, don't worry. Skyscanner Argentina will refund you. You can make this refund in cash or points. The refund method is chosen by the airline. Another option if your flight is canceled is to choose another date. 

To purchase additional baggage, you must visit the official Skyscanner Argentina website. You can purchase additional baggage when you purchase your ticket, or you can purchase it after booking, or 48 hours before your flight's departure. 

To change your flight date, contact the airline and request a date change, but please note that in most cases you will not be able to change your date without paying an additional fee.