How to apply foundation & concealer: Foundation is applied to the face to create an even, uniform colour to the complexion to cover flaws. Know the right foundation shade for your skin tone: How to apply foundation: (1) first test out the shade on your jawline to see if it matches with your skin tone. (2)apply foundation over the face and swipe downwards using your foundation brushes. How to apply concealer (1)choose the right shade for your skin tone (2)apply the concealer (3)blend the concealer using a blender.