Urban Giraffe Support

I've got headspace running quite successfully, however I'd like to be able to use it to it's fullest and ajust the more text so that it works with headspace. I'm not sure how to do that, this is what my theme looks at the moment:

<p><span class="read_more"><... href="<?php the_permalink(); ?>">Read more...</...></span></p>
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How can I adjust it to make it work? Thanks a lot for any usable comments.