Bourjois Clubbing Mascara How Do You Apply This Bourjois Clubbing Volume Mascara...?

How do you apply this Bourjois Clubbing Volume mascara...? - bourjois clubbing mascara

I have this mask (many) and I wondered, because it comes with a brush with two faces, it is to implement a particular manner (eg, some with the flat side and then the side of your hair for volume, The definition and separation? Just Want to Make Sure the full effect of this prestigious mascara.

Ideas? Thanks