To add an image to your question or response, click on the Insert Image icon (see screenshot below) and paste the link of the image address into the field.
You can add images from online as well! Just make sure you use the correct link by right-clicking on the image and select "Copy image address". The normal URL will not work. The URL has to have the file type at the end of it (.jpg, .png, .gif, etc.)!
If you want to add an image from your computer to your post, the best way to do it is uploading it to a third-party hosting site like http://imgur.com/upload then linking it in your post.
Note: Copying and pasting (or dragging) images into the body of your post will not work. You must follow the instructions above in order to successfully include an image on your post!