So We Need Help

So I start reading this review of "So We Read On" and then I decide to save it instead -- it'll be more interesting if I read the book first. 

 

So I get the book from the library, start to read it and then decide to save it instead -- it'll be more interesting if I go back and re-read "The Great Gatsby" first.
But it seems there's no longer a copy of Gatsby in this house, so I find it on the Internet.  The University in Adelaide opines that it's no longer copyrighted in Australia, https://ebooks.adelaide.edu.au/f/fitzgerald/f_scott/gatsby/chapter1.htmland and their screen is most attractive.
But my back hurts sitting at the desk.  It'd be great to finish the remaining chapters lying down. 
So I dig out the Kindle I haven't opened in a year or two.  But I've forgotten how to download onto the Kindle. 

I already have the novel on my desk computer...or am I just signing on to that web site when I read?  How do I get the novel on to the Kindle? 
Someone's attention to this matter would be greatly appreciated. 
Then I could go back and read the library book. Then I could go back and read the review. 
          Which is where we started. 
          Thanking you in advance, 
                               I remain.