how to display the subcategories on the category

Hi,everyone,
This is my fist time to use wordpress to build a website, i installed the wooecommerce,when i add subcategoies, i hope can display on the category like tree:
Category1_subcategories(1,2,3)-products
how can i change it, i seach the solution, someone said can add code, but i have no idea of code knowlege, so is thers anyone can help me, where should i put this code to, thank you very much, waiting ur help.
<?php
// if the page visitor views is a category page
if (is_category())
{
$cur_cat = get_query_var(‘cat’);
if ($cur_cat)
{
$new_cats = wp_list_categories(‘echo=false&child_of=’ . $cur_cat . ‘&depth=1&title_li=&&show_count=1&hide_empty=0’);
echo ‘

‘ . $new_cats . ‘

‘;
}
}
?>