A few different ways!
If you created an account, please login to your account by clicking here. Then navigate to "Manage Subscriptions" under Account Information section. Then click on the active subscription you want to edit and then click on "cancel subscription".
If you are having trouble logging in, you likely did not create an account and you'll need to create an account using the same email address used at checkout. To create an account click here. After creating the account, you'll be notified via email to confirm and activate your account. After activating your account, you'll be able to login to manage your subscription. Then navigate to "Manage Subscriptions" under Account Information section. Then click on the active subscription you want to edit and then click on "cancel subscription".
Lastly, if you prefer NOT to create an account, you can directly login into your subscription account section, please click here and enter the email address used on your subscription order. You'll get an email to be able to login directly to your subscription account section. Then you'll need to click on the active subscription you want to edit and then click on "cancel subscription".