Using a stand alone Windows Server 2012 Standard edition (no Active Directory),

I Tried to establish a simple remote desktop with a custom port number, but could not modify the port number in the Firewall inbound rule,

when I open the inbound property I get the next message: "This is a predefined rule and some of its properties cannot be modified"

I have tried to set it up like this: New rule -> predifined drop down list -> Remote Desktop -> check mark rules -> Allow the connection.

but still get "This is a predefined rule and some of its properties cannot be modified"

Thank you in advance.