There are three ways to delete a list:
1. Tap the three lines menu, then tap and hold the name of the desired list. Tap “Delete” from the sub-menu.
2. Open the list you wish to delete, tap the name of the list at the top of the screen and select “Delete” from the sub-menu.
3. Tap the three lines menu, then swipe the list to the right. You will be prompted to confirm the deletion, so if you are sure, just tap OK.