Changing tooth thickness tolerances

[[Na...]]

Hello!
I am trying to change the tolerance for tooth thickness on an involute gear for our rough operation. But when I open the tab to make changes to the tooth thickness, the boxes are highlighted blue and will not let me change them. I remember something about having to change the X values of the points for the tooth thickness, but can't seem to find where to do that, or perhaps I am remembering wrong.
Any help would be appreciated.

[[Wo...]]

Dear Nancy,
to change tooth thickness is the the triangle button right to the x value. Here you get a picture with the existing values and if your software is actual, you can activate input by tooth thickness.
Regard Wolfgang