Hello,
To change the “Sign in” link you need edit the file et-links.php (line 14) and replace the code <a href="<?php echo get_permalink( get_option('woocommerce_myaccount_page_id') ); ?>"><?php _e( 'Sign In', ETHEME_DOMAIN ); ?></a> with <?php add_modal_login_link(); ?>
Please try it (don’t forget to activate the plugin before).
Regards,
Eva Kemp.

