Simply go to Settings and Domain Management.
The first domain name you see when you login in is the default domain name associated with your website.
You can easily edit this! Just put down a new domain name and click on save.
You can only edit your domain name up to 3 times in a lifetime.
Answering some frequently asked questions:
1. Can I change my domain name from Spayee to Graphy?
No, you cannot change your domain name from Spayee to Graphy.
2. How can I migrate my content to a domain I own?
If your required domain is already in use, and you are the owner of that domain, delete that domain first. For quick deletion please email email@example.com since the usual deletion period is 60 days.