1. Put OPNetUDP.dll from DLL folder into "UDK\UDK-2013-07\Binaries\Win32\UserCode" folder.

2. Put OPNetUDP folder from UC folder into "UDK\UDK-2013-07\Development\Src" folder.

3. Configure UDKEngine.ini file in config folder: Find section [UnrealEd.EditorEngine] and
   add following line:

   ModEditPackages=OPNetUDP

   *Note: This line MUST be before all packages that would be using classes of OPNetUDP package.