How can i change date on American flight ticket urgently

https://data.richmondgov.com/nominate/492345
https://data.richmondgov.com/nominate/492345
https://data.richmondgov.com/nominate/492345
https://data.richmondgov.com/nominate/492345
https://data.richmondgov.com/nominate/492345
https://data.richmondgov.com/nominate/492345