Youtube doesn't make it very obvious, so if you've never done one and are having trouble finding the "button" to post a video response, it's easy.
Then, the "Create a Video Response" link ...
From here you can either select a video you've already uploaded to your Youtube account, or upload a new video, including one made with your own webcam.
After you've either selected a video or uploaded a new video and clicked the submit button, you just have to wait for the Youtube user to approve it, unless they have their settings to automatically approve video responses.
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