As in the documentation says edit header.txt and paste your own header there, with a difference that you should probably need to have those two lines of code I posted few posts before: path to the javascript file and css file.
In other words, I would put something like this in header.txt
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Useful links</title>
<meta name="keywords" content="social clubs southampton,clubs southampton,single events hampshire,new friends hampshire,new friends southampton,looking new friends,meeting new people,social clubs south coast,looking friendship uk,social clubs UK">
<meta name="description" content="A social club for people to go out enjoy themselves and try new activites">
<meta name="robots" content="index,follow">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<link href="http://club-amigos.co.uk/amigos_style.css" rel="stylesheet" type="text/css" />
<link href="http://www.club-amigos.co.uk/mboard/style.css" type="text/css" rel="stylesheet">
<script language="Javascript" src="http://www.club-amigos.co.uk/mboard/javascript.js"><!--
//-->
</script>
</head>
<body>
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