How can I delete a video uploaded to YouTube by iMovie on my account?

Hi There;

I just uploaded a video to Youtube through iMovie a week ago and I want to delete it. But I click on my account and the video doesn't show. I've tried deleting it this way:

To remove your movie from a website:

You can remove a movie you have published to YouTube, Facebook, Vimeo, or CNN iReport.

1. In iMovie, select the project in the Project Library, and then choose Share > “Remove from [site].”The Share menu appears in a light gray bar across the top of your computer screen.
2. Click “Go to [site],” and then log in to your account.
3. Remove your movie from the website.For CNN iReport, you may have to contact the website to request removal of your video.
4. In iMovie, click Done.The icon for the website in question is removed from your iMovie project.

But, I have a different version of iMovie. I must delete the video right away, but I do not know how to. Can somebody tell me how? Thank you so much, I really appreciate it.

Mario Revolori