From the channel's configuration, you will be able to see the subdomain of Help that you defined at the moment of creating it. To know the steps to create a Help channel, click here.
If you want to place Help in your own domain instead of the one provided by the platform, for example, help.yourwebsite.com you only have to inform us with which URL you want to associate it. If you do not have a custom domain, but want to configure one, contact your DNS provider and then ask Aivo to modify the site to go to that URL.