To track keywords for a YouTube video or channel, you'll need to add the URL of the exact video or channel you're tracking by clicking the blue (+) Add URL button at the bottom-left corner of the front page.
Upon adding the URL, you can choose to track these URLs for their organic ranks on YouTube and Google respectively by selecting the preferred Search Engine:
You'll need to add the URL in either of these formats:
Note: Currently, this feature does not track Video Snippet ranking at Google. It's on our roadmap, and we'll be adding it soon.