adding domain names to a vps running Heista Panel

OPTION 1 :
Point your domain's A record to your servers IP address, this can only be done if your domain name provider allows you to set A records using the domain control panel.
OPTION 2 :
Signup for a free account at:
http://freedns.afraid.org/
Add your domains and sub domains to your afraid account, setting the A record for each domain to your servers IP address.
Then point your domain to the afraid,org name servers.

You may then create a VHOST in your VPS server using the Heista Panel:

Adding a web domain

Click the  Add Web Domain button.

Enter the domain name in the Domain field.

If you wish to manage this domain’s DNS in Hestia, check the box labeled Create DNS zone

If you wish to enable mail for this domain, check the box labeled Enable mail for this domain.

Click the  Save button in the top right.