Co-authors template tags

Hello,

I am using HotWP and i would like to use the Co Authors Plus plugin, but when i went searching for template tags, I couldn’t find them neither in single.php, content.php or anywhere else. Basically this is what i need to add there:

if ( function_exists( ‘coauthors_posts_links’ ) ) {
coauthors_posts_links();
} else {
the_author_posts_link();
}

Where and how do i put it in?
Thanks for the help