If you no longer would like to own a tracking number you will simply release it, go to Numbers > Tracking Numbers.
From there you will click on Edit next to the number you wish to release
Then in the lower right hand corner of the Tracking Number Set Up screen click the Release Tracking Number button
After you click the Release Tracking Number button it will take you to a screen asking if you are SURE you want to release this number.
By releasing it it means you no longer wish to pay for that number and you wish to release it back to our stock into a cleaning process. Typically if a number has been released for more than 2 weeks we can not guarantee we can get the number back for you but we will be happy to try.