Embed videos: I can't do it (2015 Edition)

[AbbathTheGrim]

I found this thread about embedding videos from YouTube:

http://gamrconnect.vgchartz.com/thread.php?id=133855&page=1

I read all posts and tried all mentioned there and after like an hour of failures I still can't emb videos.

I remember knowing how to do it but I either forgot or it changed.

Please help.