Adding a Custom Domain Name
You will be presented with this after logging into your Zymic account. Now click 'Control Panel Home' on the left side of the page.
Adjacent to your sub-domain will be a button named 'Login'; click it.
You will now need to enter your password for your web hosting account, type it, then hit return or click 'login'
You should now be looking at your Zymic Hosting Control Panel (or ZHCP); click the option highlighted in blue
Final stage now... enter your domain in the field named 'Domain name', select 'Extra domain' for the new domain, then click add.
Job done! Your domain (providing it has fully propagated) should now be operational.