If I switch to a custom domain, is it easy to set up a redirect?

[Moin]

I think this is the guide you are looking for

Configure your domain name for hosted Discourse

So you’ve selected a hosted Discourse plan. Lucky you! The very first step is to point your domain name forum.example.com to our hosting. You will need to edit the DNS records for your domain name, example.com. In most cases, the DNS is controlled from the same place where you originally purchased the example.com domain from. Log into your name registrar and find your DNS control panel. In the DNS control panel, CNAME forum to point at <something>.hosted-by-discourse.com. The exa…

My favorite part:

@Discourse

Wait for the change to process and we’ll take care of the rest.