To only display this on the home page you need some extra PHP code as follows:
I'm not sure about the Thesis theme but in many cases you would insert the code into index.php
<?php if ( is_home() ) dynamic_content_gallery(); ?>
However, if you post the code in "the loop" it may be displayed several times. Then you need a counter as follows to restrict it to the first post:
You can edit the template files from within the WP control panel in the Theme settings. Just cut and paste the code to test, and if it doesn't work, delete the code you pasted from the template file.
<?php if ( is_home() && $count++ < 1 ) dynamic_content_gallery(); ?>
Note that <?php ?> is used to enclose sections of PHP into HTML but not needed if you are pasting the code inside some existing PHP section of code.
Hopefully this helps