When in the Draft folder, select the message to open it, then click on "Edit" in the toolbar. Make your changes and the Send button will be at the bottom of the window.
It seems like something is lacking. My message wasn't in the draft folder because it needed editing, it was there because I was not yet ready to send it. Thanks for the reply.
It doesn't matter that you didn't want to make any changes. The software assumes that you do, and that is what the Drafts folder is for. However, even if you make no changes, you still need to click on Edit to be able to send it from there.