After you log into your recruiter account, select the "Account" tab on the top right of the menu bar. You will several options like "ACCOUNT", "SUBSCRIPTION", and "PAYMENT". Select the "SUBSCRIPTION" tab. There you will find your subscription, select the red cancel button.
If you subscribed In-App you will have to unsubscribe using your Apple ID.
For more information on how to unsubscribe from Apple subscriptions please follow the instructions located here.