Membership Plugin - Full Name In Welcome Email

I have recently started to use the Website Membership plugin and am still finding my way around everything.

I have been struggling with having the Welcome E-mail display the users full name in the email after they sign up.

If I put <?php echo htmlspecialchars($PLACEHOLDERS['username']) ?> in place after the Hello, I successfully get the email to display their username.

But, if I change it to <?php echo htmlspecialchars($PLACEHOLDERS['fullname']) ?> I get an error message in the email that says this: Hello Notice: Undefined index: fullname in /XXX/XXXX/XXXXXXX/XXXX/plugins/emails/user-new-signup.php on line 44

I have tried a few different things and can never get it to display "Hello John Smith,"

Any advice or guidance?

Great!  Thanks Jason.