.Map :: MoHAA Mapping

Hi im new and Im trying my hand at editing mohaa. Anyways Im going thru some tutorials but none seem to tell you how to select brushes on the grid.

I have a bunch of brushes that Im playing with and I know that ESC deselects them but could someone list the keys or actions required to select brushes on the grid.

Shift and left click to select a brush, ctrl+shift then left click to select just one face.