This is going to sound complicated but I promise you, it's not. I don't have a smart phone so in order to get my pictures to instagram, I have to upload them to my computer from my camera and then download them to my Kindle from my laptop. It's a pain. So when H.R.Sinclair wrote a post on her blog about uploading pictures to instagram from a computer, I was so excited. Only problem was her instructions did not work for me until I started poking around my own page and figured out a way to make this work. I'm using Chrome on my laptop but I don't know if that makes any difference for these instructions.
First, log into your Instagram account.
Next, right click anywhere on the Instagram page and click on "Inspect" which should be the last thing in the drop down box.
Now click on the icon at the top of that page that I have circled in red.
Next you will click on the drop down box that I have circled in red on the left hand side of the screen. Before I clicked on it, it said 'responsive'. Then click on one of the iphone choices. It doesn't matter which iphone choice you pick. I tried all of them and they all worked for me.
Next you will REFRESH the page.
This is the most important step. If you don't refresh the page, the next step won't work.
After you refresh the page, the plus symbol should appear just like if you were on a smartphone. Now you can click that and upload a photo just as you would using a phone.