Redirect Domain

Ok, I have my domain of ascaratefishingclub.org, but when I installed the new theme that I was going with it required for it to have page named index…but now i have a new URL where my main page is at (ascaratefishingclub.org/index). I’m a newbie to WP and would like to know if there is a way to redirect them to my new main page (i.e. /index)? Thanks in advance.