While you can edit your payment information and add new credit cards to your account and auto delivery through the xOffice, you are not able to delete credit card information through the xOffice.
Due to the sensitive nature of payment information, you'll need to contact the ARIIX Partner Support team to delete old card information off of your account:
ARIIX Partner Support
Phone: 855-GO-ARIIX (855-462-7449)
Hours 8 AM - 6 PM MT