Login to your account at www.pingler.com
The go to Manage Account -> Account Settings
Scroll to the bottom of the page and your will see Account Deletion
If you do not have a current subscription in place, you will be presented with the link to delete your account.
If you have a current subscription in place, you will be asked to cancel your subscription first and then to return to the page above to be able to delete your account.
Please note that deleted accounts are irrecoverable so please proceed with caution.