Frequently a single balloon will not be able to fit all the words to be uttered by a character in your story. Perhaps a pause is needed before the next words. An extended balloon (a balloon with two or more text areas) is the solution. You can create extended balloons in two ways:
Creating an extended balloon via drag and drop:
Creating an extended balloon via option-dragging:
Hint: extension balloons are always added to the end of the chain. You can't have multiple extension balloons connecting to a central balloon, as you can with tails. This is due to the linear nature of speech—the reader would be unsure which balloon came next.