Connect KOBO Aura H2O to ADE

[#1]

I have a KOBO Aura H20 e-reader.  Unfortunately, it doesn't have the Overdrive loaded on it, which is why I trying to install ADE.  I thought I would give it another try, because the ADE has changed since I last tried it in 2017.  My problem is that after loading the new ADE onto my desktop computer (Windows) and connecting my e-reader,  I cannot seem to authorize the e-reader.  The ADE screen shows my KOBO but when I right click (as per the instructions from the Adobe website) nothing happens.  It's probably obvious that I am not a techie person, but I am hoping that someone can help me to figure out how to authorize my e-reader.  Thanks in advance.  

[#2]

See this link.  Meanwhile, I'm moving this question to Adobe Digital Editions where concerned experts will see it.

http://prod-www.kobobooks.com/ade

[#3]

Hi, Nancy.  Thank you so much for all of your time and effort. I did use the link that you provided, but the ADE questions 1-8 that were listed didn't have any further link to get the content. The links that were available were for the Kobo products and I have already explored those.  I have managed to link the e-reader and my computer but cannot open the e-book that is loaded.  The message is "Your e-reader is not authorized to open this book.  This book is protected by ADRManagement (DRM).  Because you previously deauthorized your e-reader, you need to re-import the book using Adobe Digital Editions (ADE).  Please visit help.kobo.com for more information".  I can (ironically) open the Getting Startted with Adobe Digital Editions, which also downloaded onto my e-reader.   Am I correct in thinking that the acsm file isn't downloading when the e-book downloads onto my e-reader? I have tried numerous troubleshooting links from Kobo, Adobe and the library (Edmonton Public Library)  and nothing seems to work.  Thanks again.