Click on the button on the homepage of the site that says 'I'm a teacher'.
Fill in the first registration page that looks like this:
When you've finished this page you'll be asked to fill out more information in different sections. Just click on the name of the sections to fill each one in.
Whilst you've not yet completed all the sections, the top of the page will have a message like this:
You can click on 'complete your profile' to see all the bits you're yet to finish.
When you've done everything you need to in each section, the message at the top will display like this:
Click on 'Submit for approval'. You'll be taken to your declaration page:
Once you've read and submitted your declaration, we'll receive your profile ready for review. The screen will look like this: