HOW TO APPLY BLUSH

1. Put the blush on your brush, tapping off any excess or put a dab of gel on your fingers.
2. Look into the mirror and smile. This helps you figure out where the 'apple' of your cheek is.
3. Since you want a healthy flush, it's best to apply blush only to apples of your cheeks. Keep color light & blended. If you're using gel or cream, NYC makeup artist Carlo Geraci (in O Magazine) suggests dabbing it on with your middle finger, then blend with your ring & middle finger. The clean finger will pick up any excess blush.
4. If you've gone a bit too heavy on the powder blush, a bit of translucent powder over it will calm it down. For cream blush, blot the color off with a tissue. Since gel & liquid blush 'stain' the cheeks, the only way to lighten them is it wash your face, moisturize and reapply your makeup, this time more sparingly.                                  

SOURCE: http://beauty.about.com/od/makeuptrickstips/ht/blush.htm