find a file called includes/classes/breadcrumb.php

At about line 46 you'll see this:

Code:
    for ($i=0, $n=sizeof($this->_trail); $i<$n; $i++) {
directly after it add:

Code:
    for ($i=0, $n=sizeof($this->_trail); $i<$n; $i++) {
      if ($i==1){$trail_string.='hhh';}
You can change the 'hhh' to whatever you want.

This will place the 'hhh' before the second element of the breadcrumb. If you wanted it before the third element for instance you would change the ($i==1) to ($i==2)