The application process starts in September when children are in Year 6.  Online applications are strongly encouraged; as long as you have an email address you can do this.

Guidance is available on the Bradford Council Website:  https://www.bradford.gov.uk/education-and-skills/school-admissions/guide-for-parents/

And the Guidance Booklet can be viewed here:

applying-for-secondary-school-2017-2018