The site title <h1> tag is not hyperlinked in Multithemes ‘Flexer’
http://www.multithemes.com/examples/flexer/
To make it so, modify the index.html page in the theme.
Change:
<h1>%site_title%</h1>
To this:
<a href="%base_url%"><h1>%site_title%</h1></a>