Login account > Websites page > click on the website settings > select Domain > enter the domain you want to set up.
Set up your custom domain to use with your website.
To use a custom domain, you need to set up a DNS record for your domain.
Choose one of the following methods:
For a single custom domain, you can point a single A record at the IP address below.
For example: yourdomain.com or www.yourdomain.com
You need to create a separate A record for your custom subdomain.
For example: blog