There are 3 steps to applying for an apprenticeship:
1. Search for an apprenticeship vacancy.
2. When you select a vacancy, you will be taken to the JustApply page, where you will need to log in/create an account.
3. Complete and submit your application
The National Careers Service has advice on writing applications and what to do at interviews, and the National Apprenticeship Service gives an overview of apprenticeships.