My new download works good. I imported a magizine and it shows up in the library. I want to send it to my Kobo reader but the kobo device will not show up on the digital editions page. I authorized my windows pc . What did I not do right?

My new de works good.  I imported a magazine and it shows up in the library.  I want to send it to my KOBO reader but the kobo does not show up ion the de page. I have authorized my windows pc and followed directions in the help file.  What did I not do right?