The toolbar is displayed along the bottom edge of the AKtion window. It contains icons as follows:
Opens a standard KDE "open file" dialog box, with predefined filters for the file formats supported by AKtion.
Start playing the movie
Stop playing the movie
Rewind the movie
Fast Forward the movie
Opens the Setup dialog.
Opens the AKtion help page (this document)
Just above the toolbar, on the right of the AKtion window, is a volume slider. This can be used to adjust the volume of the movie, from lower (to the left) to higher (to the right.)