Your images are depend according to the length of your article. So as long as your
articlewill be you number of images will be so increased.
Suppose the length of your article is 500 words then 1 or 2 images are sufficient, and if the length increased to 1000 words then the images could be increased to 2 or 3. The minimum number of Images to assign on your article is 1 and Maximum is 5.
To add images click on the Image logo on the writing horizontal menu of your article.
As you click on the image logo, a new window will appear which will let you go to your collection and choose your suitable
Click on the insert button as you're done and your image is set successfully.