You can access your domain name expiration details in 3 ways:

  1. From the main sites listing view when you click on a site, the summary will detail the domain expiration date.
  2. From the Domain Monitoring add-on screen you can see a list of all domain names on your account order by expiration date.
  3. From the Environment tab when you’re managing a single site.

For more information on domain name expiration monitoring, read the blog article here.