You can post a YouTube video with the [youtube] tag.
For example if my video link is: https://www.youtube.com/watch?v=fHky0Dci0zU
I would put: "fHky0Dci0zU" in a [youtube] tag.
So it is:

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[youtube]fHky0Dci0zU[/youtube]

You can also get the video URL by clicking the "Share" button on your video but make sure "Start at" is not checked.
If the link is: https://youtu.be/fHky0Dci0zU then the video code would be "fHky0Dci0zU".

Images can be posted using the "Insert image" button or by writing an img tag.
Example:

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[img]http://images.com/myimage.png[/img]