HTC One User Manual page 276

276 Other apps
Press and hold a task to delete, postpone, or move it to
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another list.
Tap
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Managing task lists
1. In the Tasks app, tap
2. From here, you can:
Tap a list to show all tasks under that list.
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Tap
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You can't create lists for Microsoft Exchange ActiveSync accounts.
Tap
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You cannot delete a main list.
to view completed tasks, sort them, and more.
> Manage lists.
and choose an account to create a list.
to rename or delete a list.