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How to change the high-speed rail ticket if I bought it wrong?

Legal analysis: I bought the ticket online, but you haven't picked it up yet. Then, you can change your ticket by computer more than 2 hours before departure. As long as there are tickets left after changing the train number, if the amount is inconsistent, it is necessary to pay again, and the original ticket purchase money will be returned to the previously paid account.

Legal basis: Article 30 of the Regulations on Railway Passenger Transport stipulates that passengers must take the bus according to the date, train number and seat specified on the ticket face and arrive at the station within the validity period specified on the ticket face.