Here's a step by step guide to applying your Membership coupon.
1. After clicking "start free trial" on the Membership page you'll be asked to create an account if you don't already have one. If you already have an account skip to step 2.
2. Select the "Monthly plan".
3. Enter the coupon code in the box on the payment page then click apply.
4. Your coupon will be applied and displayed on this page. You can then enter your payment details. If your coupon is providing an extended free period after the 2-week trial, you will only be charged if you stay subscribed after that free period is over.