You can store a document in the Polling Send Box without registering. Make the following settings as necessary.
Select Fax Box > Polling Send/Board from the home screen.
Select Polling Send, tap 
, and then select Settings.
If a password entry screen is displayed, enter the password.
Make the appropriate settings, such as Notify Send Result.
If you set a password in Box Open Password, you will be asked to enter the password from the next time you open the box.
Select OK to apply the settings.