You would need to log into ClientZone and do all the DNS changes from there. Please follow the steps below.
Click on Hosting
Select the domain you want make DNS changes on
Click on Hosting Settings
Select DNS Editor
You are also able to create a new DNS records. Some may required to be added by the DNS Administrator but most can be added by the user. If the changes require DNS Administrator you need to send an email from the primary email address of the domain in question.