Depending on the details you wish to delete in the Superannuation Lump Sum Schedule there are 2 options.
How to delete the whole Schedule:
If the information is no longer required you can delete the whole schedule.
From the Main schedule page, highlight Superannuation lump sum Schedule
Click Delete
How to delete Item details within the Schedule:
Open Superannuation Lump Sum Schedule
Select the Item
Then click Delete
Save
Close