Data Life Engine what does "$tpl->set" mean and how to implement $tpl->get in a template?

Question

DLE

I have this code: That is , as I understand it, it launches the get_summ_script () function and returns me a certain code in the summ that I plan to insert into the template template /public_html/templates/t_name/main.tpl. Question: How can I get the result in the template, I mean insert into the 'summ' template? Does not work...
$tpl->set ('{summ}', get_summ_script());

{summ}

Answer 1

what dle version?
where do you put the code?