Change size of foto in top of posts

After so much help a while ago, i hope you can help me make one last time.
I saw the other item whas resolved, so i made a new topic for my new question.

create a php file in wp-content/ name it meso-custom-functions.php and add this code.

<?php
function meso_add_featured_img_single() {
if ( is_single() && has_post_thumbnail() ) {
the_post_thumbnail(‘large’);
}
}
add_action(‘bp_before_blog_entry’,’meso_add_featured_img_single’);
?>

I have a question about this part of the site, is it possible to change the size of the foto above the posts?

This is what is see now.
http://digimama.nl/wp-content/uploads/2016/04/nu.jpg

This is how i would like it to be
http://digimama.nl/wp-content/uploads/2016/04/wilik.jpg

img size 630 x 365

So that it auto changes the size photo for every post to this size, how can i make this possible?