I've recently joined zoho, set up my mail boxes and started to use my new email addresses.  The issue I have is that the 'name' my emails are sent from isn't quite right and I want to change it.  The name appears in the from box at the top of a new email, for example

From:  XYZ < aaa@abc.co.uk>

I want to change the XYZ part

Many thanks for any help.