You can't use the gui configuration management tool since its a core install. Use powershell instead. Use the following example below that I found on mdsn's blog by Dan Benediktson. Just replace 3344 with whatever port number you want to use. FYI, this is for the "ipall" config setting.

$MachineObject.getsmoobject($tcp.urn.Value + "/IPAddress[@Name='IPAll']").IPAddressProperties[1].Value = "3344"

$tcp.alter()

Here is a link to the original post:

http://blogs.msdn.com/b/sql_protocols/archive/2008/08/29/configuring-sql-protocols-through-windows-powershell.aspx