phpinclude_start template is hidden where?

[legion_diabolic]

Referring back to the 3.5 manual I get 3 hits for "global start": "Adding an announcement", "commenting code" and 'user reputation". Do you know which of those would cover the topic of how to tell vb that I need to include an external php file in my forum header? As far as I can tell global start can be modified/edited in exactly 2 way: on, off. That's fine with me, but if global start replaces phpinclude_start and the manual is telling me to follow these steps :

"To include an HTML or PHP file into vBulletin:

Put the following in your phpinclude_start template:
ob_start();
include_once(?/path/to/file.html’);
$included_file = ob_get_contents();
ob_end_clean();Change /path/to/file.html to the path to the file which you are trying to include. You may now use $included_file in the template you wish the output to appear in. In most situations, this is header or footer."

I'm having a hard time figuring out how to do that when all I have to work with is "on" or "off".

I'm sure there is an obvious answer to all of this but after 12+ hours of trying to add a banner to my header template I'm still looking for it. Is there some secret "other" vb manual that just explains how to use the software?