@Suty The catch is that it actually takes two taps. Here are the steps.
- Go to lock screen.
- Press and hold.
- Tap Customize.
- Tap Lock Screen.
- Tap a Windy widget. This opens the Add Widgets bottom panel.
- Tap the widget again. This opens the widget's settings panel.
From the settings panel, a custom location and forecast model can be set. Thank you!