Problem with youtube in excerpt

Hello, I have bought great theme Simple Catch Pro, and I have small problem. 1. Is that youtube video won't show on front page 2. Is that I want to set on my own in editor, where will end excerpt. Is that possible? Because I found olny how long can be excerpt in Theme options. Edit: And I have forgot, When I add youtube whole link from browser, it will be showed as whole page, I mean that design will be overriden. Thank you.