how to add an existing ZOHO user to zoho people under an organisation?

how to add an existing ZOHO user to zoho people under an organisation?

Greetings,

we are unable to add a user to our organization. actually his account is already showing in our employee list but when he is signing in to his account its not mapped with the organisation account. his user id is chinmaya@247topseller.co.uk

the MSG that is displayed after he is signing in is

Your email address chinmaya@247topseller.co.uk is not yet confirmed. Please check your email to confirm your registration. If you have not received the confirmation email, please refer to this help page.


Note : If your registration is not confirmed, Zoho reserves the right to deactivate or close it later without notice.
          


Please advise. how can we map his account to our organisation?

Thank you.