For the first question,
You will need to find this line which is located in theme folder->library folder->structure folder->header-extensions.php file. Go to lines around 200.
<h1 id="site-title">
<a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?>
</a>
</h1>
Replace it with
<h1 id="site-title"><?php bloginfo( 'name' ); ?></h1>
For the second question, you will need to load font that you want via coding or via some plugins and write the custom css to use it.