How to add custom products personalization in Debut Shopify Theme

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Please I need urgent help. I Found this tutorial to add custom personalization, and I followed the steps, I could not find the place to add my code in step 2. but I add it somewhere above the 

{% endif %}

{% if section.settings.show_quantity_selector %}
<div class="product-form__controls-group">
<div class="product-form__item">
<label for="Quantity-{{ }}">{{ 'products.product.quantity' | t }}</label>
<input type="number" id="Quantity-{{ }}"
name="quantity" value="1" min="1" pattern="[0-9]*"
class="product-form__input product-form__input--quantity" data-quantity-input
{% endif %}

Where am I supposed to place code please.

But the required fields are not working on my product page, it supposed to show an error message when the field is empty. Please what am I going to do,