arzea on "Pinterest Pin Count not showing up"

The pinterest sharing button at the bottom of my posts used to display the pin count, but now it has disappeared since I updated JetPack. I found this online:

I fixed it on mine as follows

Open sharing-sources.php
Go to line 1158

You then add data-pin-config="beside" after data-pin-do="buttonBookmark"

Result should be :

return '<div class="pinterest_button">get_share_url( $post->ID ) ) . '&description=' . rawurlencode( $post->post_title ) ) .'" data-pin-do="buttonBookmark" data-pin-config="beside" ><img src="//assets.pinterest.com/images/pidgets/pinit_fg_en_rect_gray_20.png" /></div>';

Voila, you now have the pin count.

BUT, I cannot figure out where to go to make that edit. I can't find the sharing-sources.php ?? WHere do I go to edit that? Help!!