We've noticed that you recently made an incorrect attempt to map the domain name.
We've unlocked the domain booking/mapping option for you again so that you can go ahead setting up custom domain name for your site.
Please note that you should opt for mapping option only if you've bought the domain from a 3rd party services like GoDaddy, HostGator, etc. If that's not the case then you must go ahead booking a fresh domain name based on it's availability by visiting the Domains/Book section.