First, you can go to Settings->location to turn on location service. Second, you need to enable network on your phone. Then the current location will be automatically added on the locations list.
Tap location on the top left side of tool bar, then tap “+”to add your favorite destination.

Please make sure the network is already open and it works normally.
Tap the pin button on below the calendar, tap the button again to unpin it.

You can easily go back to today’s date by tapping on the highlighted date button on the tool bar.

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