After you have registered for an account, your account will have to be approved by your organisation before you can log in. You will receive an email once your registration has been approved, at which point you will be able to log in.
Your Organisation code is unique to your organisation and is required for registration. If you don’t know your organisation’s code, you can ask other users at your organisation (it is displayed on each user’s Profile screen) or from printed QR code sheets used for starting inspections.