How do I remove a domain I added from Zoho?

How do I remove a domain I added from Zoho?

Hello,
I wanted to set up a new /separate email account for a domain I own.
Unfortunately, when i was trying to do this I was still logged into my normal Zoho email account.
Now the emails which are sent to the domain end up in this 'normal' account.
I don't see any means of easily identifying which emails are coming from the domain so I want to DELETE the domain from this account and set up a separate zoho account JUST for that domain.

Can you explain how I delete the domain from my account?

Tia,
John