I am very new to Adsense so please bear with me if this is simple. I want to target ads to my site. Under Allowed Sites, I have placed the URLs of sites (seen in other Adsense ads) that I believe would benefit the audience of the web site. I have clicked the "Only allow certain sites to show ads for my account" button. But I do not see any of these sites showing up. Am I misconstruing the purpose of the "Allowed Sites" tab?