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Error on activation: "Parse error: syntax error, unexpected..."

Make sure your host is running PHP 5. The only foolproof way to do this is to add this line to wp-config.php (after the opening <?php tag):

var_dump(PHP_VERSION);

Fancy archive not working

In footer.php in your theme directory, make sure you have this code somewhere:

<?php wp_footer(); ?>

.

How can I change the CSS or HTML?

Read this: Advanced Tweaking