Function name gone?

Before I used the MB Builder, I made the code directly in functions.php

I am able to remake the whole code, except that I don't see the function name anymore. I referred to that somewhere else on my website (bootstrap, php).

I used to have:

function companyfun( $meta_boxes ) {
$prefix = 'comp-';

But now the MB Builder (and the new? online generator) say:

function your_prefix_register_meta_boxes( $meta_boxes ) {
$prefix = 'comp-';

I know I'm probably overlooking something simple, but what does 'your_prefix_register_meta_boxes' entail?