How do edit my DNS settings for a domain purchased through Zoho

How do edit my DNS settings for a domain purchased through Zoho

We have a webpage created in a third party editor which we want to make live on the domain we have just purchased from Zoho.  However after a lot of searching I've been unable to find anywhere to do this.

I got to the following logon screen from control panel

but the logon details provided for zohomail don't work and I think they are the only ones we have been provided with.

Guidance much appreciated.

Jon