To change access to task lists:
Open the Manage Task Lists page.
See Managing Task Lists.
Select the task list to modify, then click Assign Access.
Optional: To migrate a user or group's changed identity or their position in the user directory from Shared Services Console to Planning, click Migrate Identities.
Optional: To remove deprovisioned or deleted users or groups from the Planning database to conserve space, click Remove Nonprovisioned Users/Groups.
Assign: View and use
Manage: Modify
Manage and Assign: View, use, and modify
None: No access