How to set Zoho mail up to receive IMAP? - fairly urgent please

I am trying to set-up Zoho Mail for my husband. He is working with a new organisation and he wants to manage emails from their domain via Zoho. They have given set-up instructions for incoming mail as IMAP, but I can only find instructions on setting Zoho up for POP3.

Does this mean it is not possible within Zoho? or can someone advise me how to configure Zoho correctly for this please?