Customize the Footer Credits in Storefront

functions.php

<?php
/**
  * Display the theme credit
  *
  * @since  1.0.0
  * @return void
  */
 function storefront_credit() {
	 ?>
	 <div class="site-info">
		 <?php echo esc_html( apply_filters( 'storefront_copyright_text', $content = '&copy; ' . get_bloginfo( 'name' ) . ' ' . date( 'Y' ) ) ); ?>
		 <?php if ( apply_filters( 'storefront_credit_link', true ) ) { ?>
		 <br /> <?php echo '<a href="https://woocommerce.com" target="_blank" title="' . esc_attr__( 'WooCommerce - The Best eCommerce Platform for WordPress', 'storefront' ) . '" rel="author">' . esc_html__( 'Built with Storefront &amp; WooCommerce', 'storefront' ) . '</a>' ?> by <a href="https://yourdomain.com" title="Your Company Name">Your Company Name</a>.
		 <?php } ?>
	 </div><!-- .site-info -->
	 <?php
 }