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Click on the task you wish to edit from the Views > Tasks menu or any report. In the new slide panel click on Edit.
OR
Go to the Gantt view for your project.Right Right click on a task and select EditOR click on the actions drop down Image Removed. Alternatively, you can press the shortcut key 'e' on the task from the Interactive Gantt.
The information is divided into 4 5 tabs : Basic, Advanced, Custom Fields, Details.
1. The Basic tab shows attributes like: Name, Start, Finish, Duration, Predecessor, Resources.
  Additionally, there is a checkbox 'Manually Scheduled' which when checked will show up fields like: Work, Schedule Type, Constraint Type, Constraint Date.
2. The Advanced tab shows attributes like : % Complete, Priority, Start(Actual), Finish(Actual), the 'Allow Time?' checkbox and the financial columns like: Budget, Cost (Est, Material), Cost (Fixed).
3. The Predecessors tab is where you can specify dependencies of the task.
4. The Custom Fields tab displays all the custom fields attached to a task. You can view/edit values from this tab; per task.
5. The Details tab allows you to enter/edit the description text for a task.

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Note
Certain attributes for summary tasks cannot be edited (start/end dates, duration, schedule type, effort, constraints and financials) Summary tasks will always be auto-scheduled.

You can edit the following attributes of tasks in bulk:

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