Hi there,
Try this PHP snippet:
add_filter( 'generate_post_author_output', function() {
printf( ' <span class="byline">%1$s</span>',
sprintf( '<span class="author vcard" %5$s>%1$s <a class="url fn n" href="%2$s" title="%3$s" rel="nofollow" itemprop="url"><span class="author-name" itemprop="name">%4$s</span></a></span>',
__( 'by', 'generatepress' ),
esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
/* translators: 1: Author name */
esc_attr( sprintf( __( 'View all posts by %s', 'generatepress' ), get_the_author() ) ),
esc_html( get_the_author() ),
generate_get_microdata( 'post-author' )
)
);
} );
Adding PHP: https://docs.generatepress.com/article/adding-php/
Let me know ๐