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  1. Navigate to the pages/_document.tsx file.
  2. Add the following code in the Start of <head> tag section.
Check out the How to Get Site ID page to get your site ID. 
import Document, { Html, Head, Main, NextScript } from "next/document";
import Script from "next/script";

export default class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
          <Script
            id="surface-tag"
            src="https://cdn.jsdelivr.net/gh/trysurface/scripts@latest/surface_tag.min.js"
            data-site-id="SITE_ID" // Replace this with your Site ID
            strategy="beforeInteractive"
          />
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}