To Set PTR / Reverse DNS record
1. In this Billing panel go to "Services"
2. Choose active service with IP address you need to Set PTR/Reverse DNS
3. In the upper right corner click on "⋮" icon -> Click "Control Panel"
4. New window will open with VPS/VDS management control panel
5. Left navigation pane will have "Reverse DNS" section
6. Click "Add Reverse DNS" subsection
7. Pick IP address from dropdow, click "Add Reverse DNS"