1. Tracking

How can I update the time and date I did something or experienced a symptom?

In the menu at the bottom of the app, tab on History. Tap on the observation you want to update.
Tap on Edit. In iOS, tap on the date and time. Pick a new date by scrolling the left column. Pick a new time by scrolling the hour, minute, and AM/PM columns.
On android, date and time are displayed separately. Once you ok the date, you will then be able to change the time.