Need help with tag code

[Talk Hard]

Ok on this page:

http://www.scam.com/tags.php?tag=credit

Here's the current title:
<title>Search Results - Scam - Report Scams Here</title>

What file do I edit to change it to this:

<title>Search Results for: credit</title>

Also what is the code?

Thanks

I basically need the variable to make the thing searching for to be in the title