Please is there a way to redirect /index.php to forum homepage?

[Snowball1]

I am just wondering if there is a way I can redirect forums.mywebsite.com/index.php to forums.mywebsite.com without the index.php. My forum is such a way that when you type forums.mywebsite.com, it doesn't redirect to forums.mywebsite.com/index.php and when you type forums.mywebsite.com/index.php, it doesn't redirect to forums.mywebsite.com hence I am getting two separate pages with duplicate contents. forums.mywebsite.com has google pagerank but forums.mywebsite.com/index.php has no google pagerank so I will like to redirect forums.mywebsite.com/index.php to forums.mywebsite.com. I will appreciate it if you can help me in simple terms because i know very little about coding. Thanks very much for your support.