If the molecule lies on a symmetry element, click "Grow" to complete the molecule. To access a pop-up menu use the right button on a PC or do a control-click on a Mac while the cursor is inside the java frame. To measure a bond distance, double-click on two atoms. To measure a bond angle, do double-click, single-click, double-click on three atoms. To measure a torsion angle, do double-click, single-click, single-click, double-click on four atoms.