If you are wondering how to refill Humankind's deodorant, follow the steps below:
Remove the base of your container - use a tough clockwise twist where the three raised dots are.
Next, slide out the old refill through the base of your container
Now, remove the cap from your new refill before sliding your new refill into the container.
Once you have done this, -attach the base of your container again- use a firm counter-clockwise twist where you see the three raised dots.
Give the bottom of your container a couple of counter-clockwise twists; this will raise the deodorant inside to the top.