Hi..I create an html and php tutorial in my forum, the problem is when i insert the html code for displaying and example, they don't want show up. They just disappear. Although when i put "code" tag also not working...

I got trouble when typing the html code in the text area

I notice same problem arise here when to typing html code , they don't want to display.
See when I'm using [code:1][code:1][/code:1][/code:1] tag

So the problem is cannot insert html code for [b]displaying[/b] at this board?