Discourse is not compatible with cPanel. When we originally rolled out managed hosting it was a separate product with additional costs, however the demand wasn’t there and it’s not something we offer anymore. We highly recommend using Digital Ocean for which there is a guide at Discourse | DigitalOcean Marketplace 1-Click App (Digital Ocean offers an installer for Discourse). Sorry for any confusion.
I guess since this was the main reason for signing up for Reclaim Hosting I got myself an expensive domain name… Is there any possibility of cancelling my account and get a refund? If I can keep the domain I’d happily pay for it, otherwise I go for another one for Digital Ocean.