Type something into the box at the bottom, press enter, and the text will display on the screen (all in capitals, I couldn't be bothered to do caps and lowercase...) I may use this engine in future games I make, as the "say ____" and "think ____" blocks, though useful, look a bit unprofessional when used in a game, along with the default variable display.
Sorry for the low definition of the text; due to the clone limit, I used the stamp tool in this project, which prints images as bitmaps. If you don't want to wait for the text to type itself out, you can activate turbo mode by shift-clicking the green flag, which speeds it up. Though the project detects when the end of a line has been reached, it is possible that longer words will continue past the edge of the screen, and the letters will bunch up. If you are annoyed by that, then maybe use Microsoft Word instead...