Your welcome, I am still pretty new too and thought the same. To find your active key, go into your "wallet" under blog, comments, replies, rewards (in bold) you'll see more options, one is "permissions" The second option on that page is your active key on the left (labeled), click login to show, put in your password, then it will appear as a different set of numbers, your private active key. It gives other sites like busy access into your account without you giving over your password. Hope that helps =D
XO,
H2H 💜