As soon as you create your activity, you will have the possibility to edit your activity. If the activity is already created, select it in your ''Activities'' tab (under published, past or draft) then:
Click on the activity you want to make changes to
Click on Update your activity information
Click on the category you want to make a change to (all changes that are different to your contract agreement must be verified by your Local Activities Leader)
Click on Save when you have finished making changes
Once the activity is published there are some parameters that should not be changed if you already have participant registration. An example of those would be location, level or age group.