First some words of friendly advice:
Using constructions like "i need ... asap", not taking the time to construct real sentences, not finishing your words, missing the <Shift> key when trying to generate capital letters and not really asking a real question to begin with normally is not a good way of asking people for help. They might consider your message to be blunt and pushy and refrain from answering completely.
Luckily, there is Phorum.org support.
The header.tpl is not calling. It is included from the Phorum code. If you want to know what part of the code is including header.tpl: this is the function phorum_output(), which can be found in common.php.
Maurice Makaay
Phorum Development Team
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