I hope that there will be a form in the coupon area where you can fill in the code directly, instead of the current paragraph of text. This is not eye-catching enough. what should I do?
Try to add following code snippet in the child theme to change the text and make it eye catching:
add_filter( 'woocommerce_checkout_coupon_message', 'pk_have_coupon_message');
function pk_have_coupon_message() {
return '<i class="fa fa-ticket" aria-hidden="true"></i> Have a coupon? <a href="#" class="showcoupon">Click here to enter your discount</a>';
}