When it comes time to review videos that talent have uploaded you'll need to navigate to the storyline you want to review. Once you have selected the storyline you need to review content for, you'll navigate to the media tab (pictured below.)
Once you're there, you'll find all the media that is associated with the storyline. Any unmoderated media will have an approval overlay, as pictured above.
To select a video you will press the green thumbs-up button. If you decide to pass on a video you will hit the purple thumbs-down. You may want to add a little context for why you're passing on the video by leaving a comment using the comment bubble.
If you need guidance, you read more about how to choose what to approve or pass on here.