code: public void removeTag(String tagId) throws FlickrException {
          Map<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("method", METHOD_REMOVE_TAG);
  
          parameters.put("tag_id", tagId);
  
          Response response = transport.post(transport.getPath(), parameters, apiKey, sharedSecret);
          if (response.isError()) {
              throw new FlickrException(response.getErrorCode(), response.getErrorMessage());
          }
      }
docs: Remove a tag from a photo.
  
  This method requires authentication with 'write' permission.
  
  @param tagId
  The tag ID
  @throws FlickrException