How to suppress related videos from Youtube

I have found the code to suppress the related content from Youtube within a post or page, but within the Units construction page the same code does not work. (rel=0; ) Could someone give me the correct code to add into the Units module?

FYI - I used this code to work from pages and posts:
https://www.youtube.com/watch?v=QZX5O9dehI8&#038&rel=0;