Absolutely. Custom domains are not included in subscriptions but can be unlocked with a one-time purchase. Head over to your branding settings to learn more.
To use your own domain, you need to be able to alter the DNS settings for your domain. Specifically, you will need to add a new CNAME record to your domain. Instructions are given when setting up your domain inside the branding settings. If you need assistance or help, don't hesitate to write us at firstname.lastname@example.org – we'll gladly answer any further question you have about custom domains.