For all these types of questions about board code, there is a simple solution.

Everytime you hit the "reply" or "new topic" button, you get 3 link directly underneath the text window.  They are:  "Board Code, Icon Legend, Anim Legend"

If you click on Board Code, that will tell you how to do it all.

But, in case you can't find it, the technique is very simple.

Use this form: {url}www.something.com{/url}
The only thing different is for you to use [] instead of {}.  Got it?  If you need anymore help, just e-mail or IM me.  I'd be glad to help you out.