I'm so sorry about that! Was the copy option not showing under the More tab or the email details page? Please see the following screenshots to help us identify:
1.) My Campaign page > More
2.) Email Details page > top right hand side:
If you'd prefer, you may respond privately by email referencing this post with the title of the email campaign you were trying to copy and edit with your username to social_support(at)constantcontact(dot)com.