In case you had any questions on the best way to apply a self tanner, here are some tips according to the American Academy of Dermatology:
Exfoliate. Use a washcloth to exfoliate the skin prior to applying a self-tanner.
Dry your skin.
Apply in sections.
Wash your hands after each section.
Blend at your wrists and ankles.
Dilute over your joints.
Give your skin time to dry.
Apply sunscreen every day.