Comment Rating plugin: no vote is logged and nothing changes to a checkmark.Why?

Hello! I reinstalled Comment Rating plugin and now it does not work. I try to click either vote button, the button changes size as it’s supposed to but no vote is logged and nothing changes to a checkmark. Why?

At the plugin site author has a solution:
The problem is that Commet Rating javascript is not loaded. If you theme doesn’t call wp_footer() then the line to load javascript will not be inserted. Have a look at the page source code (Ctrl-U with Firefox), you should see in the Javascript in the footer section.

My question: What is a name of theme file where I should insert line to load javascript? Thanks! p.s. My site is itdistrict.ru