I am having an awful hassle with Zoho emails.

I would like my email address hello@travelgurus.com.au to be my default email. I have set it to primary  in my account.

However, I also have travelgurus@zoho.com which I guess I set up accidentally (assuming it would be a cpanel login type address).

When I go to the app on the desktop or my mobile, travelgurus@zoho.com keeps coming up and not hello@travelgurus.com.au

I tried to delete the zoho email and received the error that a zoho email cannot be deleted! 

I do not wish to shut the account down as it has been paid for.

Please help and thank you!