If you set up Google Cloud Print, then a print option should appear when you tap the printer icon. Alternatively you can save the file to Google Drive and then print from there later; the app should upload your lyrics as an image file (.png) with the formatting and text size intact. On my device, the option is Save to Google Drive and after I tap that, a print options window appears, with a Print button, and when I press that, the file gets added to my Google Drive.