Vortex calibration graph

Hello all.  Here's my problem.  Have a brand new Vortex (very few hours).  Green light flashes as it should.  Iphone recognizes it through bluetooth as well as windows computer.  First question:  can calibration be done using computer?  I cant seem to find any way.  But with the Iphone, it allows me to "calibrate" but I can't figure out how to see the color graph that shows which way to adjust the tension knob.  If I tighten or loosen it just says "calibration error".  I'm just not seeing the graph page.  Thanks in advance.