Custom Field available for all posts

HI

Thank you. It works great. I managed to render the my text field at the end of the posts using a settings page.

$step1 = rwmb_meta( wysiwyg_6ij16pfr8wx, ['object_type' => 'setting'], 'optname' );
echo $step1;

However I have trouble displaying my 'Single Image' custom field.

I tried

$step2 = rwmb_meta( single_image_wzsxrnm25hl, ['object_type' => 'setting'], 'optname' );
echo $step2;

And what it renders is "array" ....

I have however managed to render my 'single image' custom field when that field is attached to a normal post via:

$large = rwmb_meta('single_image_wzsxrnm25hl', array('size' => 'large'));
echo '<img src="' . $large['url'] . '" />';

but I cannot get it to work when the 'single image' custom field is attached to the 'settings page'

Thank YOU