Hi there,
Try this CSS to change the entry meta:
.entry-meta {
font-size: 20px;
}
Adding CSS: https://docs.generatepress.com/article/adding-css/
This snippet should move it to the bottom of the post:
add_action( 'after_setup_theme', 'generate_move_post_meta' );
function generate_move_post_meta()
{
remove_action( 'generate_after_entry_title', 'generate_post_meta' );
add_action( 'generate_after_content', 'generate_post_meta' );
}
Adding PHP: https://docs.generatepress.com/article/adding-php/