Water theme hide category from post

I am trying to figure out how to remove the postmeta info from a post on my home page of my site beckyburd.com

I’ve tried hiding it with css in style.css and style.php
.postmeta { display: none; }
in the theme’s css but that does not work.

I looked in the theme files at page.php and single.pgp but it’s hard to tell where the postmeta is generated – i’m not sure it’s in those files.

Has anyone worked on customizing the water theme before and would have some pointers on where to look?

Thanks,
Ivan