Register an account on the Pushbullet website, and confirm your account by clicking the email link. Once done, log in to the site
Download the App from Pushington (Currently only available for Android
Obtain your Access-Token from Pushington, and while you're on that page, create a collection.
Copy/paste your User-key and CollectionKey from the Pushington Dashboard into the SignUpSale site - User details page, Monitors/Notifications tab (and click the "Update details" button to save
Login to the Pushington app on your device(s) with the same email/password which you used to log in to the Pushington website