The 'Notepad' screen lets you store commonly used information at FastMail. You can put any text you want on a notepad page. Each page can be up to 64 K in size. Notepad pages don't count towards your disk or bandwidth quota. The number of pages you can create depends on your service level.
Notepad pages are not encrypted, but if you use a secure login, then any information sent between you and FastMail will be encrypted. Since only you have access to your FastMail account, only you will be able to read the notepad pages.
To add Notepad pages, in the listbox on the left, double-click the < Create new > item at the top of the listbox. Alternatively, click on the < Create new > item and click 'Select' button at the bottom of the list. This will take you to a new screen with empty/default-valued items on the right hand side. Fill in the values, and then click 'Save' to create the new item. If you want to create another new item, click 'Save and create another...'.