I am sorry for being such a noob.
At the beginning I thought this would be much easier. I mean, I am to hire a new server, setup forum, load the back up and change the domain address from the nameserver, but it turned a lot harder than I thought. 
You advised me to copy the certificates from Digital Ocean and pointed to me a document previously, @pfaffman but I am a little frustrated about that.
I told you people that I’ll have endless amount of questions and frankly speaking, I am not happy about that. Let me install to forum.craftbeer.com first, and then I’ll keep them coming.
By the way, if you ever have questions about brewing at home, I’m at your service.
Thank you.