Also for newbie's on the forum like Jello, you can quote someone's comment that has big writing and see what code they used.
Here's an example of one:
YoUnG Generations Fun Time Server Rocks!
[color=orange][size=14pt]YoUnG Generations Fun Time Server Rocks![/size][/color]
Always remember when using forum code, to finish with the name and a '/' using that slash is like the closing of it. So like [colour=red][/colour] you use it to close the colour red