# Step 1: Embed Surface Tag 1. Navigate to the `public/index.html` file. 2. Add the following code in the *Start of **``** tag* section. Check out the [**How to Get Site ID**](/platform/traffic/surface-tag#where-to-find-your-site-id) page to get your site ID. ```html ``` Using a verified custom domain? Add `data-custom-domain="forms.example.com"` to the Surface Tag. Follow the [custom-domain setup guide](/platform/traffic/custom-domains) before publishing the change.