Plot of von mises along node path

Hi,

 

i'm trying to create a plot of the vonMises stress (or any selected stress from the contour plot) along a node path.

 

this is done in the example of the following guide: http://training.altairuniversity.com/wp-content/uploads/2012/04/Student_Guide_307-342.pdf  in Step10, Page 321

 

The problem is that i don't have the 'Node Path' option in the selection list for a new measure group...  I also created a set with the nodes i want the stresses to plot.

 

And: from the picture in the guide, it says 'X Axis: Distance': what does the distance refer to? the original geometry or the deformed one?

 

I'm using Hyperworks 13.

 

Thank you in advance,

Michael