From the Tasks tab, you can fail tasks. To fail:

1. Select a task (row) to fail
   
2. Click the Fail Task button on the toolbar
   
   1. The fail button is grayed out unless a task (row) is selected
      
      
   2. The fail button is visible for tasks with the status of Not Started, In Progress, or Overdue
   3. The fail function is only available to users in the Administrator, Regular User, and Orchestration User security groups
3. Click the Fail button to confirm the fail operation. Click the Cancel button to cancel the operation.