Lightroom: Can't save metadata on photo edited by Nik Silver or Color Efects

Friends, check here http://forums.adobe.com/message/4114241 and you'll see a lot of users having problems where both Lightroom 3.6 and 4.0 can NOT save metadata after image has been edited in either Nik Silver Efects 2 or Nik Coler Efects 4. How do we file a bug with Adobe to get this fixed ? Thanks