Clear Unmistakable Errors

TWIMC: I am trying to file a claim based on a Clear Unmistakeable Error. My back was injured during an accident on a ship as were my knees. All of this is in my service medical record. I can’t find the forms to do this and was needing help on where to get the forms. The e-benifits site keeps indicating that this feature is not available anymore and I was wondering which site I should go to to get this accomplished.