It's that simple:

As an advertiser, simply tell us your customer number and/or your personal data (name and address) as well as the personal data of the person being advertised, by e-mail (service@fischer-wolle.de) or use our contact form below.
As soon as the advertised new customer has ordered and paid for goods with a total value of at least € 40 to the address you have provided, your customer account will automatically be credited with € 10. You will of course be notified of this.