that would be in functions.php, at the end:
function twentyten_posted_in() {
// Retrieves tag list of current post, separated by commas.
$tag_list = get_the_tag_list( '', ', ' );
if ( $tag_list ) {
$posted_in = __( 'This entry was posted in %1$s and tagged %2$s. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
} elseif ( is_object_in_taxonomy( get_post_type(), 'category' ) ) {
$posted_in = __( 'This entry was posted in %1$s. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
} else {
$posted_in = __( 'Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyten' );
}
// Prints the string, replacing the placeholders.
printf(
$posted_in,
get_the_category_list( ', ' ),
$tag_list,
get_permalink(),
the_title_attribute( 'echo=0' )
);
}