align xspf player within post

I use Class within css to float images. I just installed the xspf player & am having trouble figuring out the code I should use within a blog post (see example) to get the player to align properly.

This code invokes the player:
<xspf>_start()</xspf>

Can someone tell me where/how to insert:
class="left"

so that I can align the player within the post.