You might need to enable badges and alerts in Notification Center inside Settings.app on your device.
To move tasks to Completed list you need to Clear completed tasks in List. To do that tap Trash icon with checkmark above it on the tasks page.
To restore Task simply uncheck it.
For synchronization issues please take a look at the sync errors section.
For more information about the app please take a look at the how to use section.
Can’t find an answer?
Contact us via email: support [at] gotasksapp.com.