How does a customer cancel an order before it's shipped?

[Former_Member]

While I was out of town last week I had a customer send me a convo asking me to cancel her order. She didn't bother reading how much ribbon was in the listing and thought I was selling 50 yards for $4.00. I had very limited access to internet so I asked her to go in and cancel it. Where does the customer go to cancel an order before it's shipped?
Thanks

[GoTo]

As far as I know only sellers can cancel a transaction. Buyers can ask sellers to cancel it, but that's all.