Hi, I've installed the "how did you hear about us" referral mod and am wondering how to call up the field in the email_template_checkout.html file. Not sure If I can just add another field like ---> customers_referral to the list below, but am not sure how to do it or if I have to add it to another .php file first.

$EMAIL_TEXT_HEADER $INTRO_STORE_NAME
$EMAIL_FIRST_NAME $EMAIL_LAST_NAME,
$EMAIL_THANKS_FOR_SHOPPING
$EMAIL_DETAILS_FOLLOW
$INTRO_ORDER_NUM_TITLE $INTRO_ORDER_NUMBER
$INTRO_DATE_TITLE $INTRO_DATE_ORDERED
$INTRO_URL_TEXT
$PRODUCTS_TITLE
$PRODUCTS_DETAIL
$ORDER_TOTALS
$ORDER_COMMENTS
$HEADING_ADDRESS_INFORMATION

What I need is to add the referral field to the order confirmation email. Any help is appreciated...