Songs can be created from inside the Song Library. You can enter the song name and it will contain information about BPM, Time Signature, Subdivision and Accents. You can organize multiple songs into a setlist.
Setlists can be created from inside the Setlist Library. Setlists are a collection of songs. You can freely organize the order of each song.
Both songs and setlists can be loaded into the Metronome tab. This allows you to easily play them repeatedly without having to re-create them every single time. For example, you can preprogram an entire practice or performance session this way.