Dark Tales™: Edgar Allan Poe's The Mystery of Marie Roget Collector' edition

The guidebook says to put the SAFE DIAL onto the magic mirror, then click on the dials that light up First, I can't "select" anything (and I've no idea why), then I have to place the dial onto its proper location and rotate all the dials until the lights turn green.

No matter how I try, I can not get the dial to STAY IN PLACE, therefore I can't get past this step. What am I doing wrong (if anything)?

Try reading this thread.

thank you very much.