If the user allows such contact then you will find an envelope icon next to the saga-chapter creator's name - below the heading of the saga-chapter.
By clicking this icon, you will be given the chance to type in your e-mail address and a message to the saga-chapter creator through an inbuilt form. The saga-chapter creator can then contact you via a normal e-mail.
Please note! You have to be a registered user - and be logged in - to see the envelope icon in the saga-chapter.