Log into your dedicated or cloud server as administrator.
Click on: Start
Click on: Server Manager
Click on: Local Server (On left pane)
Click on: Computer name (Random Server name)
Under: (System Properties)
Click on: Computer name
Click on: Change
Under: (Member of)
Click on: Domain
Insert: Domain Name
Click on: OK
It will ask you for:
- Username
- Password
Click on: OK
Apply Changes
Reboot server to apply changes