Navigate to Administrator -> Aktiviteter
Select the activity in question, in this example, we choose "Att leda utan att vara chef" activity.
Choose a sub-activity, in this case we chose Göteborg. In the Application setting, you can control the possibility to cancel the course if you specify the date on Last day to apply. Users will not be able to cancle the course after that date. But this applies to all users in the activity.
The user will not be able to unsubscribe if the activity is mandatory.