Replacing "Blog" at header with a new title

Hello,

Thanks for all your help on this. I've had great success with GP over the past half year, but I am still sort of a newbie. I am using the "Peak Theme," and specifically the version that has "3 elements." (My understanding is that it was recently changed to reduce the elements.

My question is this:

I found a post where Tom instructed how to change the default "Blog" header (i.e. below)

But I have no idea where or how to add it.

#*****************

add_filter( 'generate_page_hero_post_title', function( $title ) {
if ( is_home() ) {
$title = 'Your custom title';
}

return $title;
} );

#*****************

Can you direct me to the right spot, or if there's an easier way?

Thank you!

Bob