I try to install SSL to this website but shows me this error all the time
What is the confusion? The error message is quite clear. You lack a DNS record for that name. A DNS query easiy confirms this. Add one to your zone at Interserver. Be sure to use the IP of your HestiaCP instance.
Error is very clear…
The domain is registred on godaddy
really? Thread nr. 3? Not going to merge it, you got enough informations here: Error: DNS record for (my website) doesn't exist
Also, please read: Please read this, before you start!
Maybe it’s better to run your website on a shared hosting or get help from a sysadmin.