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Create Surface Constructor

Go to the public/index.html file in your React.js project and add the following code at the end of <body> tag: 
 <script>
   window.onload = function () {
     const surface_src = "your_form_url";
     const surface_embed_type = "slideover";
     const target_element_class = "surface-form-button";
     const c = new SurfaceEmbed(
       surface_src,
       surface_embed_type,
       target_element_class
     );
   };
 </script>

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Add className to the target element

Add surface-form-button class to the HTML element if you want to show the form as a slideover. 
<button className="surface-form-button">Open Form</button>