For a video tutorial:
Step 1: Click the blue STYLE button in the captions editor
Step 3: Once the CAPTIONS PROPERTIES window pops up, click the far right tab that says ANIMATIONS.
Step 4: Select ON for the Karaoke Style
Step 5: Change the color of the animation if you'd like
Step 6: Save your changes
Here is an excellent example of what you make with Karaoke Animations Style Captions in Headliner: