From assumption I'd guess you're using CloudFlare, it's rather simple to connect your domain.
First of all, ensure your nameservers with the host of your domain are leading to CloudFlare's nameservers.
Then on CloudFlare, head to the 'DNS' page
For the 1st DNS record, the type should be 'A'...
All of the tutorials explain what to download as without them you won't be able to get started, matter of fact I'm not doing anything right now, feel free to shoot me a PM with TV details.
That's funny, Linux servers can't host the emulators needed to setup a Habbo retro never tried on a mac server so I'm unsure whoever told you that has little experience! No problem, you're welcome.
I don't know what you've been searching on YouTube but you can't necessarily host a Habbo retro on a Linux server anyway, never heard of Mac either.
https://devbest.com/forums/habbo-tutorials.37/ has a lot of tutorials there on how to setup a Habbo retro, find one of the tutorials and follow...
I forgot to update this but this isn't open right now since I need to make a 3.0 banner, but once it's re-opened I'll post another thread and get on this.