Don't feel bad, Terence; it did not make sense to me either, especially the url part. I don't upload images because I cannot even get my scanner to work, so that may be why I don't understand the instructions. Even the "copy and paste your post" part is over my head. Maybe someday...
I guess I have been spoiled by Macs and the ability to 'drag and drop' images. I haven't used 'copy and paste' since I gave up Windows PCs last century. Off to the sack now (other side of the world), will have a go ilisting some stamps in the morning.
The only problem I see with Mac is their file duplicity. Very strange. That and its incompatibility with the rest of the world. But then I am windows nerd. Proficient in 3.1 thru Windows 8. I used to have my floppy disk copy of 3.21 (3 disks), but discarded them a couple years ago when I got rid of my 8088. I am amazed and grateful that MS has kept the keyboard commands active.
I understood 'duplicity' was a system for secure file back-up. I personally don't use it as all my backups are put on separate data storage, image quality DVDs or Databars. I don't keep anything on the 'cloud' either. I also liked PCs until I was persuaded to switch to a Mac for my photography and artwork post production and storage. It just works so easily for that stuff and is the industry standard.
My big gripe with Apple is that the current version of their OS won't run my early version 2 Adobe Creative suite. So one option is fork out some large bills for the latest Adobe CS, or the cheaper option; partition my drive so I can keep my Adobe CS on my existing Mac OS and also get the benefit of the new Mac OS. Irritating.