Go to the Tasks tab on the Home page or in a space and click Add a task. Then type an exclamation point at the end of the task name. Example: This is my priority task! You can also click the star icon below the Get the conversation started box.
When the task is added, it will show a gold star to the right indicating it has been marked as a priority task.
You can remove the priority at any time by clicking on the gold star of the task or in the details of the task itself.