In the current 1.0 implementation, the SearchEkko plugin simply puts an expanded widget at the end of each post. It also adds a collapsed widget after the first paragraph on longer articles.

You can get the SearchEkko plugin as follows:

• Download it here. Install it the standard way, by copying the included plugins directory into your $MT_HOME directory.
• Add searchekko="1" to an MT template tag, for example
  <$mt:EntryBody searchekko="1"$>. You probably want to add it to a template called "Entry" or something similar -- whatever maps to your permalinked posts.

Also, you can modify the CSS of the widget as shown here.