You should have received an email from firstname.lastname@example.org asking to change your password, if you have not done that yet, please do so and ensure you can log into the Lexmark Cloud Print Web Portal If you can not, please email email@example.com to have your password reset.
While logged in, click on your email address in the upper right, click on "My Account" and in the "Printer Login" section click on "Reset PIN" to generate a PIN for releasing your print jobs to be printed.
To print, compose an email to firstname.lastname@example.org and attach the document(s) that you wish to print to the email. Once the email is sent, the documents will be available to print within a few minutes and you can log into the printer with your PIN to release them for printing.
If you send a print job, and do not immediately print it, it will be saved in the cloud for 2 hours before being automatically deleted.