You can download a guidance document here that gives information on how to use the verification tools. This is mostly aimed at people who are registered as verifiers on iRecord, but others may also be interested in how the process works.
The guidance has now been fully updated to reflect the recent changes to the verification page.
This is a PDF document, 1.8MB:
(Version 5.1 at 25 June has some minor corrections to version 5 at 24 June.)