You can change the time to display, font, color, and size on "say". In this example, the text "I am a sprite" will display for 2 seconds in green, chalkduster font, size 20. Many font styles will work so give it a try with your favorite font! In addition, you can use the secs to display in place of adding a stage.wait() command. If you want the sprite to keep saying the text, use 0 as the secs to display.
sprite.say(“This is a string”, secs to display, color, size, font)
Example: sprite.say("I am a sprite", 2, "green", 20,"chalkduster")