There are many ways to create your video. If you have a webcam, you can record yourself using your computer's webcam from here: www.youtube.com/my_webcam. You can also record your video with your video camera or smartphone and then upload it to YouTube.
You’ll find all you need to know about uploading your video on YouTube’s video upload page: www.youtube.com/upload You can also find more support here: support.google.com/youtube/topic/2888648
Once you’ve uploaded your video, you will find a Share link underneath it. Click on this link, then select Share this video. This will show a link that you can copy and paste into your submission.