I checked the codes. The reason why it's not working is there are missing elements in it.
To fix it do the following:
Find (2 times):
Code:
src="http://www.youtube.com/v/$post[field1]"
Replace it (2 times) with:
Code:
src="http://www.youtube.com/v/$userinfo[fieldx]&rel=1"
Replace "
x" with the Custom Profile Field ID.
I basically had the same idea as BlizzardHQ but did it on my own. For my profile I used the 3.7 codes so the look will adjust according to how I customize it. I would show the profile but you need to be logged in. The attachments should suffice.