I'm a bit confused why this 'plug-in' is needed. Isn't this actually already part of vBulletin. Can't you just use the following without having to install another plug-in? Just make a new phrase variable as referrals and make it vBulletin Global.
Code:
<if condition="$vboptions['usereferrer']">$vbphrase[referrals]: <strong>$referrals</strong></if>
Well, I guess not, but I find this exact code in the MEMBERINFO template. Not sure why it will not work in the postbit(_legacy)
UPDATE: I found the plug-in already installed in vBulletin ("Number of Referrals") for the hook_location "usercp_complete". Took the exact information and duplicated for the hook_location "postbit_display_start" then everything is as it is suppose to be. Sorry for the rant and thread hi-jack.