Click on 'Insert Images' button that you see below the article body. Then click on 'Add New Attachments/Images' button. Then click 'Choose File' button of Attachment 1 under 'Add Multiple Attachments/Images'. If you want to attach a second image, then click on 'Choose File' button of Attachment 2. Likewise you can add up to 5 images.
Next check the 2nd option under 'Attachment options' and then click the 'Submit Attachment' button. Then click 'Embed Image in Article' button. That's it. You can see the image link in your article. If you want to place the image at specific place in your article, then copy the 'Image Link' which is provided within angle brackets < > and paste it in your article body at the desired place. That's it.
To view whether the image is placed properly or not click on 'Save and View' button provided below the article body.
Hope it's clear.
Thanks & Regards