While the featured image function is part of the current WordPress core code, it must be called for in the theme being used. In order to even see the featured image dialog box in the back end, the functions.php file must include this line:
“add_theme_support( ‘post-thumbnails’ );” without quotations”

Then you can place the following call to include the featured image thumbnail where ever desired

without quotations

The image displayed will be presented in the defined “thumbnail” style, and will respond to standard CSS definitions

this technique has promise, but it didn’t work well for me – had conflicts with other code in my functions file