Sorry, I have to highlight again, I suggest you finish designing your site first, before doing these adjustments. Bring up the footer like this will cause problem to other pages when you fill up your content, the footer may go up over your content.
In your WordPress admin -> Theme Options -> Custom CSS
height: 70px !important;
Save your changes.
After that, clear your browser cache before revisiting your site.
Screenshot of the result. http://share.pho.to/9fiSl/us/original