Adding a Add Row button which then adds a new row for Amazon MTurk Form - task

Question

I have a table set up in Amazon mturk with a single row which the user can fill in with the relevant details. However, sometimes the user will need to fill in two or three more rows of data. I want them to be able to click an "add new row" button and then a new row appears at the bottom of the table which is identical to the row above for them to fill in.
I tried looking at another task to see how they got the add row button to work but I can't figure out how they did it https://worker.mturk.com/projects/3PP5EK5QU1Q6PKONUENX4D1ESGSUNM/tasks?ref=w_pl_prvw
When I include their code of <input data-action ... it gives me an error saying the name is not defined
<!-- You must include this JavaScript file -->
<script src="https://assets.crowd.aws/crowd-html-elements.js"></script
<!-- For the full list of available Crowd HTML Elements and their input/output documentation,
please refer to https://docs.aws.amazon.com/sagemaker/latest/dg/sms-ui-template-reference.html -->
<!-- You must include crowd-form so that your task submits answers to MTurk -->
<crowd-form answer-format="flatten-objects">
<div>
<strong>Instructions: </strong>
<span>XX</span>
<div>
<div>
<p>Link to the Website: URL </p>
<p>City: "${City}"</p>
</div>
<div>
<table>
<tr>
<th>Plan Name</th>
<th>Price</th>
<th>Internet Quota (GB)</th>
<th>Local Quota (GB)</th>
<th>Other Quota</th>
</tr>
<tr>
<td>
<form>
<crowd-input name="Plan" placeholder="e.g. InternetMAX 4.5GB" required></crowd-input>
</form>
</td>
<td>
<form>
<crowd-input name="Price (Rp)" placeholder="e.g. 42000" required></crowd-input>
</form>
</td>
<td>
<form>
<crowd-input name="Internet Quota GB" placeholder="e.g. 0.5" required></crowd-input>
</form>
</td>
<td>
<form>
<crowd-input name="Local Quota GB" placeholder="e.g. 2" required></crowd-input>
</form>
</td>
<td>
<form>
<crowd-input name="Other Quota GB" placeholder="e.g. 0.5" required></crowd-input>
</form>
</td>
<td>
<input data-action="more-items" type="button" value="Add Items">
</td>
</tr>
</table>
</div>
</div>
</div>
```
``