View newsstand magazine in itunes or pc?

I bought a magazine on my ipod touch for the first time and another page came up for me to sign up to view my purchase on cross platforms so I signed up then my download continued. Does anyone know where I can access this? I forgot the name of the service and I never got any email.

Also I don't see my magazine in itunes. How can I access it? It's hard to read on my ipod touch.