Using Web service to connect to BazaarVoice item Review service

Web service question:

1. We have item reviews, defined as StringCustomFieldRef.

2. now we want to add reviews or update reviews (StringCustomFieldRef).

3. We're using _port.update or _port.add method, however it does not seem to work.

The code below (will not work) is for updating an item review(StringCustomFieldRef), we also do not have clear idea to add an item review.
We need some hints or suggestions about adding an item related review and updates to it?

RecordRef recRef = new RecordRef();
recRef.setInternalId("265");//setting the internal id of the netsuite custom record

CustomRecord customRecord = new CustomRecord();
customRecord.setRecType(recRef);

StringCustomFieldRef customField = new StringCustomFieldRef();