This answer is relevant if your website has been designed and built by BT. View FAQs for Web Hosting if you built your website. If you're not sure which website package you have, please read How to get support for your website.
Your website designer will guide you how to access this information on Google Analytics. You'll be able to view information such as how many visitors your website received, where they are located (geographically) and how they found your website.