You can use the VoiceOver rotor to change how VoiceOver works. You can adjust the VoiceOver volume or speaking rate, move from one item to the next on the screen, select special input methods such as Braille Screen Input or Handwriting, and more.
Add another language: Tap Speech > Add New Language (below Rotor Languages), then choose a language.
Have VoiceOver confirm rotor actions: Tap Verbosity, then turn on Speak Confirmation.