You can choose to have the program ask for a password after activities are completed in the settings (the default setting is to have the password request switched off). 

You can change this option by doing the following:

1. Go to the main menu

2. Tap settings

3. Set 'Password' to 'Not Required':

If you choose to set the password to 'Required', the password is 'readingdoctor' (all lowercase).