Go to www.zoosk.com in the browser of your choice and log in. This will allow you to delete your Zoosk account. After that, go to your account settings by clicking on your profile image and selecting that option from the drop-down menu. Click the Edit button next to "Account Status," then click the Deactivate button. Click the "Deactivate" button to confirm your decision, and then proceed to inform Zoosk why you're leaving.