To be able to pay the parking fee a car entry must exist and must be selected ().
To create a car entry, just swipe to Cars screen and press the (+) button in the action bar or tap anywhere on the empty car list. This will open the Add Car screen:
Note: The icon indicates the error in input, caused either by missing mandatory value, a duplicate or invalid entered value. Tapping the icon will display the type of the error.
Once the necessary values are entered, the changes can be saved by either pressing the Done button in the action bar or by pressing the device Back key.
Pressing the Discard button or swiping away will discard the changes.
Once saved, if it is the first car entry you created, it will automatically be selected.