Tasks connected to a project:
To add an approval to a task, open the Advanced Options of your task.
Scroll to the Requires Approval By field. Select who the task is assigned and who must approve the task.
When the task is finished by the assignee, the approver will be notified to approve the task.
All tasks that need approval will show up in the Pending Approval part of the Dashboard. Click to approve the task or to deny.
Once approved or denied, click the task to go to the project. You can then leave a comment inside of the task or project to give more information on why it was approved or denied.