To delete your account, go the Members area of the website and DELETE your website. With all of them deleted, you are out of the system.
To remove Woopra, deactivate and remove the Plugin or script from your site and Woopra will no longer be able to track your stats. Uninstall Woopra from your computer in the traditional uninstall method for your operating system.
I subscribed yesterday and gave the URL of my domain. For example: domainname.org. It is now pending approval. Since then I realized that what I really want is to analyze the data of a subweb of the domain. Today I tried to add a new account. For example: domainname.org/addedaccount but got the message that it wasn't available. I then went to delete the domainname.org account and it said that if deleted it could never be used again, or words to that effect. I don't want to risk not being able to gather stats from the root doamin so I'm reluctant to delete it.
I, too, would like to know if I delete the account I currently have setup if it will take another three or four weeks before I can add another one or if once I'm in I can delete and add which site I want to track at a time.