You must complete the "Cancellation Form" through your account on this website.
Log in to your account here: https://www.effective.fitness/login
Once logged in, you should be on the "Library" screen, from there click "Effective Fitness Training", then click the "Manage Membership" tab in the top menu and follow the instructions.
When you cancel, you lose membership immediately, you do not get to keep the membership for the rest of the month.
*It takes 24 hours to process cancellations, if you cancel within 24 hours of when your subscription renews your card will be charged.