Go to [nop4you / To Do List Manager / Configuration] and configure plugin, you can specify four checkboxes.

Send email when task is created – if you check this box plugin will automatically send emails to the staff when the new task will be created.

Allow staff to edit tasks – If you check this box staff will be able to edit

Allow staff to delete tasks – If you check this box staff will be able to delete tasks.

Allow staff to delete comments – if you check this box staff will be able to delete comments added to tasks