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We would need a little more information to be able to help you further.
When I check your account, I can see that you have multiple domains and sites with us.
Which site is it that you cannot publish, and to which domain would you like to publish it?
I'm afraid to let you know that it's not possible to change a domain name once it has been registered. The only thing you can do is to let it expire. But you can purchase an additional new domain at any time and assign your website to both your old and new domain.