so I saw 変更 and now im confused

so today was literally the worst i had to rush to the station because i thought i lost my wallet but it was just in my bag anyway i was trying to change my ticket on the machine and this big red button said 変更 and i just stared at it like is this going to delete my ticket or what?? like it felt totally 無理 to understand in the moment. is 変更 just for any change or did i almost break the machine lol help