Step 1. On the editor, click Produce

Step 2. Click Email Campaign

Step 3. Change Embed Location to Embed On WordPress & Send

Step 4. Click WP to download the plugin or Download here

Step 5. With your mouse, hover on Plugins

Step 6. Click Add New

Step 7. Click Upload Plugin

Step 8. Click to choose the downloaded zip file from your computer

Step 9. Click Install Now

Step 10. Activate the plugin if not activated by default.
That's it, You're done!