According to the manual it should be possible to add vst intruments and effects (and direct x versions) to move score - but the option is not there. It-s suppsosed to be when you chosse intstruments and then add but the only option is to buy extra instruments
when the video starts it says Music Maker. It could be a mistake. If not please watch that or do as follows:
1.Click instruments tab of the media pool
2.on the left there are vst instruments and object synthesizer you can click on any one they will appear on the right.
Click PLUS SIGN on a track header instruments on the left side of each track.
Hope you are not using trial version. In trial version there could be some limitation.