registered mail
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A: But anyway I’m going to send this parcel by registered mail.
B: Registered mail, good idea! What’s that?
A: Well, to register something means you make a note that you’ve sent it.
B: Oh, how do you do that?
A: Well, to show that they received your parcel, the post office gives you a registration receipt like this. And you write your name on the receipt and the destination that’s where you’re sending the parcel and the date, and then the post office will write a number on your parcel and the same number on the receipt.
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What does “you make a note” mean here?
Thank you