How to add a "Add +" button when creating a Module

Hello!
I am working on creating my first custom module - A simple flex box container that will have product cards in it.
Whenever I am looking at other custom modules, I usually see an “Add +” button to create, say, another card and add it to the list of cards. How can I add something like this to my module?
I was looking over other modules that are built like this, but I don’t see any options or settings to get this done. I thought it might have been added whenever I group the fields together, but I can’t seem to figure it out.
Any advise would be great! Here is the module code that I was trying to work with:
{% for item in module.cards %}
<div class=“card”>
<h1>{{ item.card_title }}</h1>
{{ item.card_content }}
</div>
{% endfor %}
My module group is called “cards” and the fields I have in the module are card_title and card_content.
Thanks!

Repeater Fields


Barry Grennan

Freelance HubSpot CMS Developer

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Thank you, Barry!