You can embed a message widget on any Facebook Page that you are an administrator of. Unfortunately, embedding is not supported on Facebook Profiles - you must be an admin of a Facebook Page.
Step 1: In your page's settings, add a custom tab and activate any 3rd party app that allows embedding of static html.
Step 2: Once that's in place, simply paste the html iframe snippet from your message settings into the box for html code and save to render the widget.
Now, all of your supporters on Facebook can deliver your messages directly from your Facebook page!