You "end" the unwanted listing in your list of active listings.
I'm not seeing any active or completed of yours either on ebay.com.au or here on ebay.com (where you are currently logged in to be able to ask this here--be careful when you set up listings to make sure you are on the correct site: here on ebay.com any listing you set up will be in US Dollars and "Domestic shipping" will be to the US, not Australia).
