Create a php file and name it "upgrade"
Now go to ACP > Themes & templates > Templates > Global Templates > Add template.
You will need to write your own content.
You can edit that however you wish. But make sure you call the template "upgrade" since the php file is called that as well.
If you have any questions, feel free to hit me up.
PHP Code:
<?php
define('IN_MYBB', 1); require "./global.php";
add_breadcrumb("Upgrade", "upgrade.php");
eval("\$html = \"".$templates->get("upgrade")."\";");
output_page($html);
?>
Now go to ACP > Themes & templates > Templates > Global Templates > Add template.
You will need to write your own content.
Code:
<html>
<head>
<title>Upgrade</title>
{$headerinclude}
</head>
<body>
{$header}
<table border="0" cellspacing="1" cellpadding="4" class="tborder">
<tr>
<td class="thead"><span class="smalltext"><strong>Upgrade</strong></span></td>
</tr>
<tr>
<td class="trow1">
Add here your custom messages.
</td></tr></table>
{$footer}
</body>
</html>
You can edit that however you wish. But make sure you call the template "upgrade" since the php file is called that as well.
If you have any questions, feel free to hit me up.