[Plugin: Meteor Slides] Where to paste the code in homepage?

Here is the code you need do that, further up in the thread it explains where to place it, or check out this video.

Thank you for your note. In the video you explain how to insert the slideshow in the header image. But I would need to maintain the image header and to put a slideshow below the header menu. May you tell me where I am supposed to put that code in order to have a slideshow under the menu header?
Thank you very much

This code is for the nav, put the template tag after that if you want the slideshow below the nav:

<div id="access" role="navigation">
			  <?php /* Allow screen readers / text browsers to skip the navigation menu and get right to the good stuff */ ?>
				<div class="skip-link screen-reader-text"><a href="#content" title="<?php esc_attr_e( 'Skip to content', 'twentyten' ); ?>"><?php _e( 'Skip to content', 'twentyten' ); ?></a></div>
				<?php /* Our navigation menu. If one isn't filled out, wp_nav_menu falls back to wp_page_menu. The menu assiged to the primary position is the one used. If none is assigned, the menu with the lowest ID is used. */ ?>
				<?php wp_nav_menu( array( 'container_class' => 'menu-header', 'theme_location' => 'primary' ) ); ?>
			</div><!-- #access -->