1. Visit the official Britain's Got Talent website: https://www.itv.com/britainsgottalent
2. Click on the "Apply" button.
3. Fill out the application form with your personal details, contact information, and a short description of your act or talent.
4. Upload a video of your performance or talent demonstration (up to 150MB).
5. Check the box to agree to the terms and conditions and privacy policy.
6. Click on the "Submit Application" button.
Your application will be reviewed by the producers and casting team of Britain's Got Talent. If your application is successful, you will be contacted by the team to schedule an audition.
Note: The application period for Britain's Got Talent varies each season. Check the website for the current application dates and deadlines.