Problem with text style for About preacher

The About [preacher] text style is inappropriate for my theme but I cannot find where to change it. I’ve looked at the Style sheet in Sermon Browser

http://www.calvarypresbyterian.org/worship/sermon-archives?sermon_id=142

I’ve tried searching your site but there are a number of “README file could not be found…” messages on pages your site which should instead contain useful information.

http://wordpress.org/extend/plugins/sermon-browser/