POP officially shut down on December 15th, 2020. Your account was transferred to our reseller partner, DomainBox. If you have any questions or problems, please first direct them at DomainBox Support and remember to include your domain name in the email. Read the official announcement.
Basically, Pop.co is a bundle of online services that should remove any barrier between coming up with a cool idea and building a web presence around that idea.
This is a clever service. I know a lot of people who want a custom domain, Google Apps, and a website and don't know how to setup any of them.