Why don't my matrix fields show up to calculate?

Hello Support - I've inserted a matrix into my form, and I want to perform calculations in some columns of the matrix and calculate totals in the bottom row.  When I use the Form Calculation widget, my matrix fields do NOT show up!  Please see screen shot below.

Please help!

Looks like you haven't performed any calculation, the wizard is empty:

Please check this guide that shows how to do it: https://www.jotform.com/help/343-How-to-Perform-Form-Calculation-in-the-Matrix-Field 

Let us know if you need more help.

Just to let you know, you need to scroll down, and select the matrix field, you can show the headers if you want to:

Let us know if you need more help.