When configuring a class, you can set it up to allow students to select a subdomain from a domain you own. For example, if you have marketingbyjohn.com, you can have your students choose amazing.marketingbyjohn.com as their domain.
To setup a domain for this to work with, you will need to go to your DNS hosting company and add a * record so that it points to 18.104.22.168. This will make every subdomain on your domain point to the DragonTeach server, so, when a student configures a subdomain, the DNS is resolved to the correct place.
Note: DNS setups can be tricky sometimes and do have the possibility of causing other things to stop working if not configured correctly. Contact our support for help getting this working.