Sociable shortcode

Can anyone please tell me where I can find this:

Under the line add_filter( ‘the_excerpt’, ‘auto_sociable’ ); in the sociable.php file (found under wp-content/plugins/sociable/), put this line:
add_shortcode( ‘sociable’, ‘sociable_shortcode’ );

I can’t seem to find wp-content/plugins/sociable anywhere.

Also, is there a way to put a Pinterest button on?

Thanks,
Tess

https://www.ads-software.com/extend/plugins/sociable/