yes it works

I cant do it because i think in control panel you have selected something that does not allow users to use HTML codes panel.
Go to the forum and check out something about it.
Just make a new user not administrator and try to add news entry,or just by guest mode.

[size=18]Or it could be my computer's mistake.[size=18]

I see what you mean...I didn't realized that before.
Anyway it has the same behaviour in your own site so I guess that noone of us is wrong. Just hit the "All codes" button and try to use the BB-codes [video][/video].