Can't create new user on domain email on Zoho

Can't create new user on domain email on Zoho

I moved my domain email, pervisim.com to Zoho and am wanting to create user accounts. In the control panel there is only one option "Add" and no "Create".  When i add the mail account, pat.stevenson@pervisim.com, it tries to send an invite to this email address which of course won't work.  How can I fix this?