Using free trial - how do I add my personal domain? Where is Admin console?

Using free trial - how do I add my personal domain? Where is Admin console?

Hi

I have signed up to the 15 day free trial to evaluate Zoho Mail, to see if it will meet my personal needs.

I want to test sending and receiving emails using my personal domain name, but I can't see how to set this up.

I have tried installing the Admin App on my phone but it says I dont have super user privileges, and I can't see where I can alter privileges.

Can someone explain how I do this please?

Thanks