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Registered, but can't make the convention

I pre-registered a while ago, but I can not make it to the convention this year.
I read that I can use my registration towards next year.
My question is, what do I need to do to see that that happens?
Do I need to get a number or something, or do I just do nothing and then show my current transaction ID number next year?
What's a Yena to do?! ^"^