In case you don't believe him, BlurredD is right there. 16 Bit + Low Detail water is the best for taking screenshots, as while the water on the left half or so of the screen will look like normal low detail water, the right half will be invisible, allowing for the best possible water screenshots.
First, select the text string you want to edit. When selected, it will be blue. Then click on it, and wait a little while. Then type. @ is for a new line, and # makes all letters after it rainbow colored.