How to insert / attached a media file in the post

[TopShot]

OK - it could be sounds silly to ask - but I need to know
How to insert / attached a media file in the post (YouTube video or something similar)?????
Do I need certain template tweaking or an Add-on??

Many thanks in advance!

 

[TopShot]

Never mind - I figured it out - it was so damn easy. . . .!

 

[Floris]

For those who still want to know.
In 1.0 and 1.1 you click on the film icon in the toolbar, enter the youtube url and press the submit button.
On 1.1 you can even just paste the youtube url and submit the post. It will then most likely be auto embedded.