Unless otherwise indicated, the code snippets you see below should be placed into your theme’s functions.php file.
Here is the code to remove the entry meta on your site:
<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.
//* Remove the entry meta in the entry header (requires HTML5 theme support)
remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );