custom sort, how to insert code.

I have a questions on the tempera theme. When you updated the theme you changed the functions.php file. I need to be able to custom sort my posts via each catergory. I had put that into the “functions.php” file but now that doesn’t work. I’m no developer so need it kind of simplified. Please help, thanks.

racingrivalsresource.com

I was using this

function foo_modify_query_order( $query ) {
if ( $query->is_home() && $query->is_main_query() ) {
$query->set( ‘orderby’, ‘title’ );
$query->set( ‘order’, ‘ASC’ );
}
}

to sort by time which sorted by time. Thanks.