IPv6 is already preconfigured on your server and just has to be activated in some cases.
You can achieve this on Linux as follows:
Connect to your server via SSH, execute the command enable_ipv6 and restart your server.
If you use Windows please perform the following steps:
Login via RDP, open the command prompt CMD, execute the command reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters" /v DisabledComponents /t REG_DWORD /d 0x00 /f and restart your server.
You can find further information about the configuration of IPv6 addresses in our tutorial.