You have to - ADD CANDIDATE as usual and input the very brief personal details required for identification when the applicant logs in.
At the bottom of the page you will see two choices -
1.
If you choose option 2, an email is immediately sent to the applicant (using their email so ensure this is correct) with confidential login details. When they have completed the process, they will be logged out and you are notified to validate the ID etc and process as usual if you are satisfied with the content.