Hello again,
There are few ways to open up Windowblinds configuration window. If you have Windowblinds running in the background, you just need to look for Windowblinds icon in your taskbar tray area and right click on it and select "Configure Windowblinds" that should open up the Windowblinds configuration window. Click on per application tabs and you should get something like my screenshot above.

Thank you,
Basj,
Stardock Community Assistant