Stereophile On-Line Subscription

I signed up for Stereophile from Zinio, and now I cannot figure out how to get into my account. At that time, I browsed through the first issue of my subscription.  But now, several weeks later, I cannot figure out how to get back in to read the magazine.  On the Zinio main page, I see a button for "My Library", but when I press that, I get a message that there is nothing in my library.  I cannot find any other way to get in.  Can anyone help?