Just send them to saabclub.com/join and give them your details.
At the checkout page, they should enter your name, and optionally your email address and/or SCNA member number. We will let you know by email when we verify this, and your expiration date and theirs will automatically be moved out by one or two quarters.
*Nines is published quarterly. If that changes in the future, the referral bonus will add one extra issue to each membership, according to the publication period at that time. Your SCNA member number is on your Member “Card” (login), and we will start printing it on your Nines address label for easy reference. Referral bonus only applies to new SCNA members.