To use the chat effects, you will need to write the code, and a colon ( : ) right after it with no space, and then your message without a space before the first word. For example, writing red:Hello would make you say "Hello" with a red font, but if you throw in a space and write red: Hello, you would actually say "Red: Hello" in game... Here is a full list of the codes:
Colour codes: Movement codes:
Red: Text is red.
Yellow: Text is yellow (default colour).
Green: Text is green.
Cyan: Text is cyan.
Purple: Text is purple.
White: Text is white,
Flash1: Flashes between red and yellow text,
Flash2: Flashes between cyan and blue,
Flash3: Flashes between light and dark green,
Glow1: Text fades from red, to orange, to yellow,
to green, to cyan,
Glow2: Text fades from red, to magenta, to blue,
to dark red, to red,
Glow3: Text fades from white, to green, to white, to cyan.
Wave: Text moves up and down,
Wave2: Text waves diagonally,
Shake: Text shakes bizarrely,
Slide: Text slides from up to down,
Scroll: Text scrolls from left to right.
Now, if you want to do something really advanced, you can use one of the colours AND movements at the same time. For this you need to write the colour first, and then scroll/wave. For example you could write something like this red:wave:Hello everyone and you would say "Hello everyone" with a red waving text.
hope this helps