You can select which Reminders Lists and Calendars you want to use in GoodTask.
Go into ‘Settings – Lists & Calendars’.
Tapping i button will let you edit certain list. While editing, you can edit title and color of the list. You can also delete the list or even delete all completed tasks inside that list.
List Order can be set on this menu. List Order will be used when you select a list for a task. Also when you run text snippets, lists on top will be selected first.