1) To report someone for copying your video on YouTube, click on this link:
http://www.youtube.com/t/dmca_policy
2) Click on the rectangular box labeled "Copyright Complaint Webform"
3) In reply to the question "What is the issue?", click on option for "Copyright infringement (Someone copied my creation)"
4) In reply to the question "Copyright infringement - Who is affected?", click on option for "I am"
5) Fill in the links for "Videos to be removed" section
6) Provide the information for "Tell us about yourself" section
7) Click on all three boxes for "By checking the following boxes, I state UNDER PENALTY OF PERJURY that:"
8) Finish the last few pieces of information requested and "Submit Complaint"
9) Wait a few hours and check your email for confirmation of complaint from YouTube. (I checked mine and my complaint was confirmed).