If you want to edit Scheduled Issue Sub-Task, navigate to a Scheduled Issue details page (visible only after accessing particular issue) and choose Edit icon next to the Sub-Task:
The following screen will appear after clicking the pencil icon:
...
If you want to edit Scheduled Issue Sub-Task, navigate to a Scheduled Issue details page (visible only after accessing particular issue) and choose Edit icon next to the Sub-Task:
The following screen will appear after clicking the pencil icon:
...