How do I adjust the header height of a blog?

wordpress

#1

How do I adjust the header height of a blog? By “header”, I mean the caption that is on the top of the blog. I looked around the dashboard and I did not find where the setting is. I figure it must be the same place regardless of the theme I am using.

http://www.fislam.com/wordpress-3.2.1/wordpress/?p=13

I thought that maybe it was a browser setting, that I had some font setting in the browser set wrong. But it seems that this is not the case. Does it appear like the caption of this blog is too be to you? To me, the text runs into and overlaps the line below it.