From the main window of MySlideShow you can create your slideshows by selecting them from your computer and by dragging and dropping them in the program. 

From the View menu you can view your slideshow in full screen mode or you access MySlideShow options. 

If you go to Sync Playlist from the SlideShow menu you will see this box, where you can add music and syncronize it with your pictures. 

From Tools choose Executable (or press F9 on your keyboard) so you can export your slideshow together with the music you added as a stand-alone executable file.