Where can I place this code to have the character counter?

[RamdonGhai]

<a href="http://www.smartwebby.com/DHTML/textbox_characters_counter.asp" target="_blank">http://www.smartwebby.com/DHTML/text...rs_counter.asp</a>

Where can I insert that code so there is a character counter on my new thread and reply to thread pages?

THanks alot

I don't know where to start