In order to edit an applied plan we need to revert it back to published.
This is done by removing the applied activity and then editing the plan.
Please Note: You will need to re-apply the activity once you have finished editing the plan.
From Plans, select the applied plan:
Then select View Application:
Click Delete this Activity under Actions, then Continue on the pop-up:
Click the back arrow to take you back to the Plan as Published:
You can now edit the plan:
If you wish to a delete a plan, please click here: How do I delete a plan?