The store administrator can adjust the email message by which new vendor staff members are informed about the profile creation and invited to log in for the first time. You can find this email message in the Email Notifications section of the store’s Admin area (Store Setup > Email Notifications); it is called "Vendor staff invitation":
The store administrator can adjust the content of the vendor staff invitation message like in any other X-Cart notification. For more info on X-Cart store notifications, see Quick Guide on Email Notifications.
Note that the vendor staff invitation notification may not be disabled if the store uses the Multiple Profiles for Vendors add-on.