You will need to edit archive.php. In that file you’ll see some strings of code something like this one block (one condition):
<?php if ( is_category() ) { ?>
<h2 class="pagetitle">Archive for <?php echo single_cat_title(); ?></h2>
This is just part of a series of them. What it’s doing is asking what kind of archive, then spitting out the proper heading (both fixed part “Archive for”, and the variable or dynamic part <?php echo single_cat_title(); ?>. In other words on this example it’s instructing the PHP server software to echo or put to the page the Category name IF the user requested a category ELSE IF this or that so on and so forth.
What you want to do is remove the fixed part of the heading, so instead of this part:
<?php if ( is_category() ) { ?>
<h2 class="pagetitle">Archive for <?php echo single_cat_title(); ?></h2>
You’ll want it to be like this:
<?php if ( is_category() ) { ?>
<h2 class="pagetitle"><?php echo single_cat_title(); ?></h2>
You will have to do this to 5 lines. Category, Daily, Monthly, Yearly, Search.
It’s not at all hard, just take your time and make sure you only remove that portion.
Mike