As you share your article, for example on Facebook, you might want to control the image that comes along with it. Simply upload the image first to your 'Files' menu.
Then find the blog article you want to add your image to, click on 'Article' menu and you'll see the article setting menu where you can select the image.
After you've picked your image, make sure you save the changes. Now, as you share it, you should see this image next to your article.
