Non-project time is also known as non-billable time, and is time you wish to track, but which is not directly related to a specific project. Some examples of non-project time could be, e.g. sickness, vacation, meetings, workshops, etc.
Step 1: Go to Admin in your personal menu
Step 2: Go to Non-Project Time in the side menu
Step 3: Give it a name, and click Add Non-Project Time
Repeat steps for all of your categories of non-project time.