Three screens probably means three ui.Views present()ed one after the other:
import sound, time, ui
def screen(title='title'):
button = ui.Button(title=title)
button.action = lambda sender: sender.close()
button.present(hide_title_bar=True)
button.wait_modal()
for title in 'login configure play'.split():
screen(title)
for i in xrange(7):
sound.play_effect('arcade:Explosion_{}'.format(i+1))
time.sleep(1)
You are creating your ui in the Pythonista ui Editor? If so, hit the + inside the square at the top left of the screen to add a new subview to the main view. Each .pyui file will be one screen so you will need login.pyui, configure.pyui, and play.pyui to create your three screen game.