Custom domains are available for the Maker plan and above. To set up a custom domain, you can follow the instructions on this page: https://www.glideapps.com/docs/custom-domains.
In this article, I will show you how to set up your domain so your app can be accessed from both yourdomain.com and www.yourdomain.com using GoDaddy.
Inside the dashboard, locate the DNS Hosting tab in the left panel.
Select the domain.
Click the "Add New Record" button.
Input a CNAME record with "www" as the name and "yourdomain.com" as the data.
Input an A record with "@" as the name and your domain's IP address as the data.
You need to wait several minutes for the changes to take effect. If it doesn't work, try testing it in other browsers.