It is a 'cash on pick up' sale so the buyer would not pay through Ebay.
Have a look at your emails from Ebay - you should have one saying your motorbike sold and who the buyer is,
You need to contact the buyer to exchange details so you can arrange for them to come and collect the bike and pay for it.
You were probably being asked if you wanted to cancel the ad.
It's a good idea to leave the ad. live on the site until your vehicle has been collected and paid for - there seem to be a lot of 'buyers' who agree to buy but then never actually turn up and pay.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)