It is very simple: click on 'Settings' at the top left corner -> 'Domains'. You will find your current Simvoly domain. Click on 'Connect an Existing Domain' and enter your domain name.
Once you enter your domain and click 'Next' you will have it added to your list of domains with information that you need to enter as a setting at the place where you bought your domain name.
If you wish to claim your free domain after subscribing for yearly plan, please Contact Us on the Live chat or on the ticket form so we can connect it to your account.
Please note that once you connect a domain and enter the domain info appropriately it takes up to 48 hours for the connection to be completed.