Non-teaching blocks are perfect for things that aren't classes (e.g. Lunch, Recess, etc), as they allow you to enter them into your timetable, without the bulk of the Lesson Planning editing feature. Here are the quick and easy steps to create a non-teaching block:
Go to the Subjects page.
Click the add button in the top right (+ icon).
Choose 'Non-Teaching Block'.
This will then create a new non-teaching block which you can name whatever you'd like. You can even pick a colour!
In order to add it to your Timetable, simply follow the steps on how to insert a class into your timetable.