Mac, Adobe and Kobo

I have an iMac, just fitted with new hard drive. I have installed Adobe Digital Editons. I have an Adobe ID. I cannot authorise my computer. Just get error message incorrect log in or ID for selected ebook vendor. The vendor is shown as Adobe ID  Kobo is not on the list. What am I doing wrong? Spent 3 hours last night waiting for Chat who could only tell me my account was activated!