Tap on the yellow Calendar or yellow GO button.
A calendar screen will appear. This will display the current month and any events you have added to it.
If you slide your finger across the screen from left to right, the previous month will be displayed. If you slide your finger from right to left, the next month will be displayed.
If you tap on the ☰ symbol in the top-left-hand corner of the screen a list of choices appears. You can use this to choose whether you have a month, week or day displayed on the screen. You can change this at any time.
To return to the main Petals screen, tap the ◁ symbol on the bottom-left of the screen.