For a video tutorial:
Step 1: Click the blue STYLE button in the captions editor.
Step 3: 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.
Here is an excellent example of what you make with Karaoke Animations Style Captions in Headliner: