You can edit that by editing the Novator Main Page Carousel block. Login as admin, go to Design --> Blocks --> and find the Novator Main Page Carousel, You can also go to Design --> Layout --> Home Page and click on the edit button on the Novator Main Page Carousel block. . You can modify the HTML as appropriate. The text you referring to is in this section:
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<p class="h5">Feature rich with smart UI</p>
<h1 class="my-4 h2"><span class="text-primary">Easy & Fun</span> To Manage</h1>
<p class="mb-4">Feature reach shopping cart application right out of the box. Standard features allow
to set up complete eCommerce site with all the tools needed to sell products online.</p><a href="#" class="btn btn-outline-dark">Install Now</a>