How to edit WordPress footer, do not know PHP?

This is the PHP code for the footer:

<footer id="colophon" class="site-footer" role="contentinfo">
    <div class="container">
        <div class="site-info">
            <a href="<?php echo esc_url( __( 'http://wordpress.org/', 'flymag' ) ); ?>"><?php printf( __( 'Proudly powered by %s', 'flymag' ), 'WordPress' ); ?></a>
            <span class="sep"> | </span>
            <?php printf( __( 'Theme: %2$s by %1$s.', 'flymag' ), 'FlyFreeMedia', '<a href="http://ift.tt/1GMsJyb" rel="designer">FlyMag</a>' ); ?>
        </div><!-- .site-info -->
    </div>
</footer><!-- #colophon -->

I'd like to remove the "Proudly powered by WordPress | Theme: FlyMag by FlyFreeMedia. And replace it with Copyright 2015 | Company Name