1. To like a video, just click on Like underneath the video and a thumbs up sign will show up. Your friend will be notified when you like his or her video
2. To comment on a video, click on Comment, and you will automatically be taken to the comment textbox.
3. If you are allowed to share your friend's video, you can click on the Share link and share it on your newsfeed with your other friends
4. To rate a video, click on the stars on the right hand side of the page, which is underneath the video. You can select 1 up to 5 stars, 1 being the worst, and 5 being the best.