Those pessengers who have booked their flight through the website of Ryanair, Ryanair change flight date within 24 hours can be made. The pessengers have a grace time period for making changes in the tickets. If you filled the wrong route then you have the option to reverse the route. Pessengers have to pay the fare difference between old and new flight tickets.

https://airlinespolicy.com/flight-change-policy/ryanair-change-flight-policy/