I would like to use zoho as a service to receive emails for my owned domain ( user@mydomain.com).

However I am not sure how to activate that feature as an old user with existing free @zoho.com email account (I always get redirected to my free account inbox). In other words I am looking to switch to payed plan. Is there an option to add custom domain and a new user that I am missing, or do I have to make a completely new account on Zoho to activate custom domain feature? Thanks.