Buttons and menus are named exactly as the app shows them.
Steps
Start something that takes time
Start begins a session as it happens, such as a workout, a study block or going to bed. A timer begins and follows you around the app.
Where: Any tracking tab › Start
Finish it from anywhere
Stop the timer wherever you are. The session is logged to its tab and shows in your calendar.
Log what already happened
Log opens the same form for something that is over, with the details filled in by hand.
Where: Any tracking tab › Log
Add from any screen
Quick add logs something or starts a timer from wherever you are, and the plus in each tab does the same without leaving it.
Where: Quick add