Under Windows it’s C:UsersYOURUSERNAMEAppDataRoamingBforartists
But Bforartists 0.9.3 should show a copy previous settings button in the splash screen when you run it the first time, like Blender does. So no need to carry everything over by hand.
I will make a screenshot tomorrow when needed.
As a sidenote, this is the Blender news … ^^