If you want to add an image to the text of a question, you can use the HTML Editor to quickly insert an image uploaded to your File Library.
Edit the question and click into the question text field. Click the Full Mode button in the editor toolbar.
Click the Insert Image button to bring up a list of the files in your File Library.
Select the image from your File Library that you wish to use and click Insert Image. It will insert the image at your cursor but you can then move it around as needed and use the other formatting options as needed.
If you have the image hosted on an external site, you can input the URL in the Image URL field and click Insert Image. Make sure to include the http:// or https:// at the beginning of the link.
If you need to insert another image in the same question, simply repeat these steps!