If your domain has expired less than 40 days, we will be able to recover it for you if you follow the steps given in this tutorial: Manage the domain you purchased from Yola.
However, if your domain has expired for more than 40 days, there's nothing we can do to restore it at the moment. Your only option at this stage is to wait for the domain to be released and then repurchase it.
If you wish to remove the custom domain from your site, you will need to unpublish your site by following the steps in this tutorial: Unpublishing your website.
If you did not receive renewal reminders for your domain, please click on the email link below and let us know. We can try and investigate why you did not receive them.