Thank you for reaching out to the Community. I do apologize you aren't able to add in an image or a spacer to your email campaign. You can click here for a tutorial on how to navigate through our original and third generation editors.
If you are following these steps and still having issues, it may be the browser you are working in. A couple ways to optimize the browser you are working in is clearing the cache and going into safe mode. If you find that neither of these options work, you may want to try switching to a different browser altogether.
If problems still persist, please email us at social_support(at)constantcontact(dot)com with your username, the name of your email campaign, and a reference to this post and we will investigate further!