This video refers to Wysija, which is the original name for MailPoet (it changed names recently).
The first part of this video deals with changing settings and managing subscriber lists, which you will not need to worry about. Watch the last part (it should start automatically around the 5 minute mark) to see the drag and drop features.
From the WordPress side menu, click MailPoet. You’ll see a list of newsletters. Find the ones that say TEMPLATE. Hover over the template of your choice, and click Duplicate.
For most purposes, use the Engaging Email template of your choice (message or update as appropriate).
A screen will show you some choices for getting your email set up.
The second screen will show you the layout for your email. Important: when you’re working in MailPoet, it will NOT autosave your work! Click on the save button frequently. (located at the bottom of your email)
The last screen lets you do a final check before sending your email.