there has benn a TON of people messing this up. i don't see how, but apparently there is a need for a tutorial.
let's say you want to link to google. what you do is click [ image disabled ] thta button, then this will show up:
[link=hyperlink url][/link]
what you do is you put the adress of the link you want (in this case http://www.google.com) where it says "hyperlink url" NOT between the ] and [. you put a site description between the ] and [.
example: this is correct
[link=http://www.google.com]google[/link]
it results in google please note that the http:// is required for it to work right