Hi,
Once downloaded and installed, you just click on a frame or scene to apply it over your webcam video. Frame will put a border around your video, and scene will put your video within a scene, like a poster board or a movie scene.
You can actually see a demonstation in this tutorial:
https://www.cyberlink.com/learning/youcam/1520/apply-effects-for-webcam-recording---im-chatting
If your question is that you are not sure how to install the downloaded scenes/frames, see this FAQ:
https://www.cyberlink.com/support/faq-content.do?id=6721
Dave