Renaming index.php links

[iHasZombiesHD]

So the other day I resently renamed my index.php to forums.php. Now, I noticed a couple things that really did not make me so happy, and that is when viewing online.php I noticed that all members and guest where viewing a Unknown Location, when really they were looking at the index, which I renamed to forums.php.

Here is a screen shot: http://gyazo.com/0dae466a718206e39d13517a14fff42d

So my question is how can I fix that, and rename all the index.php links, to forums.php?

Thanks