To edit the homepage slider with a new or additional video:
1) Click on MetaSlider Pro in the wordpress menu. It is the bottom option.
2) Find and click on 'Home Page' from the list of sliders at the top of the page.
3) You will see a list of the current slides in the slideshow. Right now, there are two slides of the same video, so that it replays for site users to watch twice.
4) To change the video, replace the current youtube link with the youtube link for your new video. Make sure the link includes 'watch' in it for it to work correctly. This will be the url of the video page from youtube.
5) Once you are happy with your edits, click on the 'Save' button in the upper right corner to make your changes live.