Hi @albertomiotti,
I hope you are doing well today.
To add extra slides, you would need to edit the theme’s file (inc/slider.php). In that file, go to sydney_slider_template() line. Then add your slides HTML code right after loop statement. Ref: https://i.snipboard.io/yfdkhu.jpg
Here is HTML example for 3 additional slides:
<!-- Slide 6 -->
<div class="slide-item slide-item-6" style="background-image:url('YOUR_IMAGE_URL');">
<img class="mobile-slide preserve" src="YOUR_IMAGE_URL" alt="" />
<div class="slide-inner">
<div class="contain animated fadeInRightBig text-slider">
<h2 class="maintitle">Welcome to Sydney</h2>
<p class="subtitle">Feel free to look around</p>
</div>
<a href="#primary" class="roll-button button-slider">Click to begin</a>
</div>
</div>
<!-- Slide 7 -->
<div class="slide-item slide-item-7" style="background-image:url('YOUR_IMAGE_URL');">
<img class="mobile-slide preserve" src="YOUR_IMAGE_URL" alt="" />
<div class="slide-inner">
<div class="contain animated fadeInRightBig text-slider">
<h2 class="maintitle">Welcome to Sydney</h2>
<p class="subtitle">Feel free to look around</p>
</div>
<a href="#primary" class="roll-button button-slider">Click to begin</a>
</div>
</div>
<!-- Slide 8 -->
<div class="slide-item slide-item-8" style="background-image:url('YOUR_IMAGE_URL');">
<img class="mobile-slide preserve" src="YOUR_IMAGE_URL" alt="" />
<div class="slide-inner">
<div class="contain animated fadeInRightBig text-slider">
<h2 class="maintitle">Welcome to Sydney</h2>
<p class="subtitle">Feel free to look around</p>
</div>
<a href="#primary" class="roll-button button-slider">Click to begin</a>
</div>
</div>
In that code, replace YOUR_IMAGE_URL with your image URL, that you can get from media library (Dashboard > Media).
Please note that this file change will be wiped out when you update the theme in the future. So you will need to do this change again after updating.
I’d recommend doing this in your non-production site to avoid any error while working with coding. Please test it first before deploying it to your production or live site.