1. Add it as an Insert effect to the vocal channel that you want to fix.
2. Open the Melodyne effect.
3. Click the TRANSFER button (top left of melodyne window)
4. Get cubase to Play the track between the locators.
(melodyne will listen to the channel in import it once the song gets to the right locator)
When the track has finished importing then do one of these options:
A. You could click the the CORRECT PITCH or QUANTIZE TIME button near the top of the screen and Melodyne will automatically quantize or retune the vocals between 1 & 100% (1= still out of tune, 100= roboticly in tune) 85% sounded good for me.
B. Or to selectively tune some of the track whilst leaving the rest untouched, right click the words that are out of tune and use the mouse to move them into tune/into time.
I downloaded, installed, licensed, played about with the plugin and fixed some vocals in 1 hour without reading the manual.
Laters