[Max Taxable]

Goto the plugin manager find the hook on "register_addmember_process" by "Is bot" and change webmasteremail to the preferred email you want the messages to be delivered to.

Find:

PHP Code:

vbmail($vbulletin->options['webmasteremail'], $isbot_subject, $isbot_message, true); 


Replace with:

PHP Code:

vbmail($vbulletin->options['you@yourmail.com'], $isbot_subject, $isbot_message, true); 


With "you@yourmail.com" being your preferred email address.

The reason it didn't work before? You used " instead of just ' when you changed it, looks like.