You want to flexibly change the title or the maximum number of participants for a class or training?
Click on the menu item 'Activities' and navigate to the class you want to edit. To open the pop-up just click on an appointment or on the three dots and then on 'Edit appointment'.
In the quick edit pop-up you can edit the settings for the selected appointment. Your changes don't have any influence on all other appointments of that activity.
Always remember to apply changes by clicking on the green "Save" button.