Here again is the calibration widget where the "Variable" button is used to select the data type (VisSq, TripleAmp, or TriplePhase) which is to be calibrated.

If you meade a mistake and want to start over, I recommend using Undo|Reset to remove the calibration of the selected data type, i.e. VisSq, TriplePhase, or TripleAmp.