loop-single locaton

Kind TagDiv Staff,
first of all, i’d like to say that your theme is wonderful. I maintain a Cinema and Music Magazine and thanks to your theme, it’s reborn.
My magazine is full of reviews (from 2005) and use Custom Fields to show additional info to our readers (Movie director, movie actors, year of production, movie poster and so on).
My problem is to add the PHP code that displays Custom Fields to your theme, in the loop-single.php file.
I’d like to modify it thorough FTP and i’ve read all the forum topics about “Advanced Custom Fields” plugin.
In my Cloud Template section on wordpress the cloud theme used by all posts is “Default Pro”.
So i’ve tried to insert the PHP code to display the custom fields into the following files, without any success:

1) wp-content/plugins/td-standard-pack/Newspaper/loop-single.php (i’ve insert the PHP code, no success)

2) wp-content/themes/Newspaper/loop-single.php (i’ve insert the PHP code, no success)

So to test the “advanced custom fields” plugin i’ve tried the following method:

a) modify through FTP one of the loop-single contained in wp-content/plugins/td-standard-pack/Newspaper/PARTS/SINGLE , in particular i’ve tried to modify loop-single-1.php

b) Edit a new post on WordPress using Style 1 template on “post setting” into the “general” tab

The Custom field appeared!!!

so the plugin works perfectly but it doesen’t work with Default Pro loop single.
And this is an huge problem, because the magazine has more than 10.000 reviews with several additional info and datas that at this moment are invisible for all our reader.
A great damage 🙁
please help
Take care

Thanks Calin, very kind of you.
There’s a plugin different from ACF that works better?
In any case what i ask is simple to put a Custom Field Code (a basic function of wordpress) to let meta data seen for the readers, is an important part for a cinema website 🙂
Thanks so much