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Kimberly, you can get additional credits and PBS Money for postage by referring new members. Once a member who has been referred by you indicates that you are their referring member (this happens automatically when they use the links from your blog page!) and then posts their 10 books, you get a referral count started in your name.
The banners you download and personalize from PBS will indicate to the system from your personalized data on the banner who you are, so that proper referral credit is given. Here is the Referral Rewards system in place: