Adding speed to a video or audio clip
You can add speed into a timeline clip using right-click context menu of a timeline video or audio clip (Speed > Add). You can adjust the settings to produce slow motion or fast motion.
Editing speed of a video or audio clip
You can Edit speed of a timeline clip using right-click context menu of a timeline video or audio clip (Speed > Edit).
For a complete description of the Transitions functionality, see the user manual by clicking the Help Button (?) and selecting User Manual. In the manual browse to Chapter 3 – The Movie Editor > Editing movies > Speed.