How to allow Remore Desktop Service in Firewall

Hi

I installed openSuse13.1 VM in a Windows Server 2012 Hyper-V and assigned it a static IP.
I then downloaded and installed xrdp from http://software.opensuse.org/131/en.

In every forum I came across, it says that I must allow "Remote Desktop Protocol" service in the Firewall.
But I do not see this option under Allowed Services -> Service to Allow dropdown.

Could someone please explain, how do I enable Remote Desktop Protocol on the firewall?
I need some assistance with remote desktop into this openSuse VM from my Windows 7 laptop.

Thanks in advance

R