A new field starts out with a pretty generic name.
This can be changed with the blue "[edit]" link in the custom field box.
For this demo we'll create a "Meditate" action to record when you start and stop meditation sessions.
Click the "Done" button when done editing the field name.
We're not quite done yet. There's a "Save" button just off the bottom of the field preferences panel that needs to be clicked. (Auto-save will be coming in the future! We're working on it.)
Ok, saved, done.
And back to the newly expanded home screen with the "Meditate" duration tracking field.