Theme Twenty eleven – Change size header text

Hi Luzi,

Go to Settings, then General. On the right change the site title too whatever you wish.

Many Thanks
J

thank but i would like to change the dimension

Are you talking about the menu text size or the header logo?

text of the header

Do not edit the Twenty Eleven theme. It is the default WordPress theme and having access to an unedited version of the theme is vital when dealing with a range of site issues. First create a child theme for your changes.