Afan, I can tell you're going to be doing all the fancy stuff in no time!
With YaBB code, if there's one little typo then the little buggars won't work. Each tag is enclosed by [ and ] but not { or }. Here are examples of tags that might come before your message text:
[b] (bolds)
[u] (underlines)
[size=3]
[center]
[color=LimeGreen]
[quote]
Following the 1st tag and the message text you'll type the 2nd corresponding tag, which must contain the symbol /
These tags correspond with the list above and will come at the end of your message text:
[/b]
[/u]
[/size]
[/center]
[/color]
[/quote]
So to make your post pink, the tags have to contain all these keys:
[color=Pink]your message[/color]
Did that help?