How to delete backed up files on pc for iphone?

So basically i upgraded my ios to 6.0.1. I backed up my data before i did it so i don't lose anything important and retrieved it back now. I want to know how to delete the data on the computer because it was my cousins computer i used and i had important and private contacts/ messages on my phone.

Edit> Preferences then choose the backup you want to delete from the Devices Tab.

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