The Pingdom Help Centre here at https://help.pingdom.com is our official documentation on how to actually do things with Pingdom.
Other than that though it's also possible to sign in and view tickets you've had with Pingdom Support or raise feature requests in our Community.
To sign in simply click the sign in button.
Now comes the peculiar bit, if you've had contact with Pingdom support you have an account registered already but you do not have a password. Simply get a password and you'll have an email with a password reset link within minutes.
With that you're then able to see your ticket history as well as take part in our community to vote and comment on feature request.