@ enko. The artist/song scroll is set under preferences and relates to MusicBee as a whole, not just this skin.
Go to Edit / Edit Preferences. Select Now Playing from the left vertical menu. Under the section heading 'playback', put a tick in the option 'scroll in player as:'. You will also need to identify the tags you wish to display/scroll in the box next to the option. You can either type directly into the box or use the drop-down selector to choose your desired field(s). In my case I have <Artists: Artist> - <Title>.
Two things to remember:
1). If you have the 'show details on multiple lines' option selected under Preferences / Layout(1) / (bottom panel) / (main Player) this can override the above tags/fields depending what you choose to be on the second line. For example, if you use the scrolling option I gave above but select the second line option to have <Artists: Artist> - <Album> as the second line option, when it is active the first line will only show the song title and the second line shows artist - album.
2). Only the first line scrolls when using the multiple lines option.
Hope this helps