php coding help

I’m trying to fix up the polls plugin. Currently, since my site has permalinks on, when I try to vote when inside a post, I can’t because the submit button for the poll calls index.php which won’t load due to the permalinks. I’ve looked in the php file, and found the places where it says “index.php” and i’ve changed those to “/” but that doesn’t seem to work either. It just brings my main page and the vote doens’t go through either. How can I make it so that after you click on the vote button, it’ll stay on the same page if you’re inside a post?