Guide!! Can I change a flight I have already booked?

https://www.az-pneu-vertical.sk/forum/general-discussion/guide-can-i-change-a-flight-i-already-booked
https://www.az-pneu-vertical.sk/forum/general-discussion/guide-can-i-change-a-flight-i-already-booked
https://www.az-pneu-vertical.sk/forum/general-discussion/guide-can-i-change-a-flight-i-already-bookedhttps://www.az-pneu-vertical.sk/forum/general-discussion/guide-can-i-change-a-flight-i-already-bookedhttps://www.az-pneu-vertical.sk/forum/general-discussion/guide-can-i-change-a-flight-i-already-booked