Add Custom Post field in Portfolio

Hi everyone, got a little problem here, i’m a noobie at PHP and I’m struggling…

I made a Custom post type with ACF whitch say I sould use :
the_field(‘motcle’)
I have added a plugin portfolio and I found where it display the content of the project :

$html .= “<h2 class=’title’>{$title}</h2>”;
$html .= “<h2 class=’title’>{$title}</h2>”;
$html .= $content;

So first I tried this :

$html .= “<h2 class=’title’>{$title}</h2>”;
$html .= “<h2 class=’title’>{$title}</h2>”;
$html .= $content;
$html .= <p>the_field(‘motcle’);<p>”;

Didn’t worked.

Then I tried to add this to another part of the document :

$size = ‘full’;
$thetags= the_field(‘motcle’);
$current_post[‘title’] = get_the_title();

and then modify :

$html .= “<h2 class=’title’>{$title}</h2>”;
$html .= $content;
$html .= $thetags;

Didn’t work either. Thanks for you help..