click the Contact Us link on the left hand side. E-mail them with your skin type, complexion, age and how you found them. Good luck!
Details of the freebies are on the welcome paragraphs on the website:
"Jane Iredale mineral make up Colourchart and Product brochure, an Application brochure plus samples of PurePressed Powder, Amazing Base Loose Powder, Liquid Minerals and Dream Tint available on request as well as JaneIredale beauty expert advice on skin care and make up (please register with us including your address and then email us with details on your skin type, complexion, age and how you found us)."