Go into Edit your profile...
Scroll to the bottom and find the section that asks for a Video ID.
The bold text is the video ID. You can find it in your address bar when you're in TWT Videos or on Youtube (the ID is the same at either place) If you're in TWT Videos we also provide a box below the video with the code in it.
Then pick a title for your video... You can also add your YouTube username- this will be for future enhancements to the videos section.
After you get a video up, check out Customize Profile link in your UserCP (or right there..) You can customize the colors of links, text, and backgrounds. Use your album pictures to personalize your profile background even more! (only album pictures work)