> For the complete documentation index, see [llms.txt](https://support.fibr.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.fibr.ai/get-started-with-fibr-ai/fibr-script/configure-fibr-script-to-your-website.md). # Configure Fibr Script to your website {% embed url="" %} Adding the Fibr Script takes about five minutes. Once it's installed and validated, you're ready to start running experiments and personalization campaigns. *** #### **Before You Begin** Make sure you have: * Access to your website's HTML (specifically the `` section) * Admin or developer permissions to edit your site's code * Your Fibr account credentials *** #### Step-by-Step Installation **Step 1:** Log in to your [Fibr Dashboard](https://app.getfibr.co) and click **Settings** in the left-hand menu. **Step 2:** Go to the **Setup** section. You'll see your unique Fibr Script displayed here. **Step 3:** Copy the script and paste it into the `` section of your website. Place it as high in the `` as possible, before other scripts like analytics or tracking pixels. This ensures Fibr loads first and can deliver experiences without delay. {% hint style="warning" %} **Avoid GTM installation** Google Tag Manager adds a delay that can cause flickering. [**Click here**](/get-started-with-fibr-ai/fibr-script/impact-of-fibr-script-using-gtm.md) to see impact. {% endhint %} ```html ``` **Step 4:** Save and publish your changes. **Step 5:** Back in the Fibr Dashboard, enter your site URL in the field provided and click **Add URL**. **Step 6:** Click **Validate**, then **Check now**. You'll see a success message once Fibr confirms the script is working correctly. *** #### **Handling Subdomains** If you add the script to your main domain (e.g., `example.com`), it will automatically apply to all subdomains (e.g., `blog.example.com`, `shop.example.com`). However, if you want the script to run only on specific pages or subdomains, you'll need to add it individually to those pages instead. **Remember to whitelist all domains:** In your Fibr workspace, make sure every domain and subdomain where the script runs is added to your allowed list. Otherwise, Fibr won't recognize traffic from those URLs. *** #### **Troubleshooting: Fixing Flickering** If you notice a brief flash where the original page appears before the personalized version loads, try these fixes: **Option 1: Use the anti-flicker script** In the Setup section of your dashboard, you'll find an alternate version of the script designed to prevent flickering. Switch to this version if the standard script causes issues. **Option 2: Check your script placement** Flickering often happens when the Fibr Script loads too late. Make sure it's positioned at the very top of your `` tag, before any other scripts. [Learn more about impact of Fibr Script on Web Performance →](/get-started-with-fibr-ai/fibr-script/impact-of-fibr-script-on-web-performance.md) *** #### **Validation Failed?** If the validation check doesn't pass: * **Double-check the script placement.** It must be inside the `` tag, not the ``. * **Clear your cache.** Your browser or CDN might be serving an older version of your page. * **Verify the URL matches exactly.** Include or exclude `www.` consistently with how your site loads. * **Check for script blockers.** Ad blockers or privacy extensions can sometimes interfere with validation. Still having trouble? Reach out to us at and we'll help you debug.