You can set them on the play screen during playback.
Shuffle songs
Tap ‘Shuffle’ to turn on shuffle for the songs in a playlist.
Repeat entire songs
If you tap ‘Repeat’ once, the entire playlist gets repeated.
Repeat a single song
If you tap ‘Repeat’ twice, a single song will be repeated.
A-B Repeat
If you tap 'A-B' at the start point and endpoint that you want to repeat the part, the part will be repeated.