Question: how to do ipsy add ons?
Answer: Go to IPSY.com/glambag/addons as soon as it goes live (that's at 6AM PST on the 2nd of every month). And act fast: This page is only live for 24 hours or while supplies last.
Choose your Add-Ons. ... 
We'll ship your Add-Ons for free with your Glam Bag, Glam Bag Plus, or Glam Bag Ultimate.