All the way at the bottom of a thread is the "Quick Reply Box". The problem with putting a video into that area is that there is no "YouTube" button in that section. To get a video into the "Quick Reply Box", you will need to know the special codes, more on that later.
To find the "YouTube" button, click the
button located at the bottom of any post. At the top of the "Message:" box, you will see the
button. When you click it, the system will put this code "[YOUTUBE][/YOUTUBE]" into your "Message:" box. It is there, between the 2 middle brackets that you need to put the special "YouTube" codes to embed your video into the message.
From within YouTube, the code that you are looking for is located in the "URL" link area. It is the sequence of numbers and letters located after "?v=". Just copy those letter located AFTER "?v=" and paste them between the 2 middle brackets like this [YOUTUBE]LKI67rWQ[/YOUTUBE].
If you are trying to embed a video into a NEW THREAD, you will see the special "YouTube" button,
at the top of your "Message:" box just like the "Reply" box.