Once a song has been added to your list of favorites you use the "select" button in the upper right and corner on the main screen to access it.
Next press the "Song" button
Tap to select the song you want to work with.
Once we have selected a song tap the "select" button in the upper right hand corner of on the main screen
Tap the button labeled "Phrase"
Tap to select an existing phrase or press the "Create a new phrase" button .
To change the start or end points for an existing phrase, tap the "arrow" button.