Cant bring up the style variable editor!

[DaveHe]

Hi all -

Very new user here

I chose the light blue built-in style because it's close to what I want. Now I just need to edit a few text/bg colors and I'm good to go. But, I can't launch the style variable editor!

When I look at the style manager, I see that style. I can select 'style variable editor' in the dropdown, then click 'GO'. I see a blue box around the GO, but nothing happens.

What am I missing here?

thanks !