Jetpack Photon and Custom field images

You should be able to edit your theme to make sure the images are called via Photon when it’s activated. You can follow the instructions here to do so:
https://jetpack.me/2013/07/11/photon-and-themes/

Yes, but i don’t know how to implement with my shortcode, custom field, to display the images through the Photon CDN. All images from my site are displayed by this
Shortcode:
<?php myabp_print_thumbnail(85, 85); ?>
85, 85 = width, height

Custom field:
mabp_thumbnail_url
my site is jocurihd.com

Like this?

if( function_exists( 'jetpack_photon_url' ) ) {
    add_filter( 'jetpack_photon_url', 'mabp_thumbnail_url', 10, 3 );
}

You should start by adding the following to your theme’s functions.php file:

if( function_exists( 'jetpack_photon_url' ) ) {
    add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
}

Then, locate the function that is creating the image tag from the Custom Field value. It will include something like this:

get_post_meta($post->ID, 'mabp_thumbnail_url', true)

Now, you will need to add jetpack_photon_url and the size in there, like so:

$args = array(
    'resize' => '85,85',
);
$image_url = jetpack_photon_url( get_post_meta($post->ID, 'mabp_thumbnail_url', true), $args );

$image_url might have a different name, so this will depend on your theme. But the idea is to wrap get_post_meta into the jetpack_photon_url function, and to add the image size there.