Be able to add images to Robo Mailer not as an attachment

I would like to be able to add images to the body of the robo mailer instead of as an attachment at the bottom of the email that they may or may not click on. Whenever I have tried inserting images into the boy of the email it shows up as a blank box or error. If this is already possible could you all make a video showing us how to us the insert an image function?