Navigate to the next time skip screen.
Change the status to ‘Not set’.
Changing the status to 'Not set' will delete the current Next Tiny Step.
You can now enter a new Next Tiny Step.
Once you have done that you will be sent a confirmation email that you have set a Next Tiny Step. The email also contains an .ics. Click this file to add you Next Tiny Step to your calendar.
Be aware that the event in your calendar for the Next Tiny Step you set previously will still be in your calendar. You will need to delete that event manually.