“Once you have your DBS certificate, it’s time to apply for your IRDT account, and PRN. Your IRDT account is the Integrated Register of Driver Trainers and your PRN is your Personal Reference Number
Applying can be done at the link below. Keep your account details safe as you will need it further on in your qualification process.
You will need to select the ADI Register and enter your driving licence number from your photocard driving licence. After that, you will need to enter your DBS Certificate number.
Following this, you are asked to either supply a photo for use on your ADI badge, or consent to the DVSA using the photo from your Driving Licence.
Finally, by clicking Finish you will submit your application to DVSA for consideration. DVSA aim to process applications within 10 working days.
Upon your application being approved, you will be given your Personal Reference Number – keep a record of this as you will need it to take the qualifying tests!”
https://www.gov.uk/update-approved-driving-instructor-registration
