I could use some help with this. I’m new to Wordpress, so I don’t really know how to use the CSS text editor, so not I’m not sure where I would copy/paste the code posted by Andreas. (I presume somewhere in the Css style sheet (Appearance–>Editor).
I have a selfhosted wordpress site (www.drnicoleredmond.com) and went to Appearance–>Theme Options–>Header options. It appears you can choose either a Header text OR Logo but not both.