Delete team project from Visual Studio Team Services

I am using Team Services on domain visualstudio.com and I need to delete one project, I found out that I need to use command prompt to delete projects, but when I tried the script it seemed that it doesn't work

My Script is,

TfsDeleteProject 
  /force collection:https://mytfs.visualstudio.com/DefaultCollection MyProject

My first mistake was that I didn't append DefaultCollection to the URL, but now I get error that I don't have privileges.

Thanks to @Christopher I was able to make the script work.

You can use the following command from the "Developer Command Prompt":

TfsDeleteProject /collection:https://mytfs.visualstudio.com/DefaultCollection MyProject

You can now do it via visualstudio.com

1. Open the administration context for the team project collection by choosing the gear icon.

   

2. Open the menu for the team project that you want to delete.

   

   If you don’t see the actions icon , either you’re not accessing VSTS or you’re not a member of the Project Collection Administrators group.

3. You must type the name of the team project in order to initiate the delete operation.

   

1. Open “Developer Command Prompt” under “Program Files>Microsoft Visual Studio” or in Windows 8 type “Developer“.

2. In the command prompt, use this command template below to delete your project from TFS. Replace the YourTFSName to yours and also the ProjectName to the name of your project.

   TfsDeleteProject /collection:https://YourTFSName.visualstudio.com/DefaultCollection ProjectName
   

3. Hit Enter and then Y if you are prompted for confirmation.

4. Done. Double check by login to your TFS online.

From http://bizvise.com/2013/03/08/how-to-delete-team-project-from-my-team-foundation-service-tfs-default-collections/