When school has shared activities with you via Kwieb, you will see them on the timeline or in the Agenda. If you want to copy an activity from Kwieb to your own agenda, press the button "Add to agenda"
Press the button and you will get a screen with all the information that will be copied to your own calendar. You can still adjust this to your own liking. When you agree, the activity (as a copy) will be placed in your own agenda.
Tip: Please note that when school changes the activity, the change is of course not immediately processed in your own agenda!
Doesn't it work? Does this feature not work on your phone? Then it may be that you have not given the Kwieb app sufficient rights to write in your agenda. You can change this on your phone in the app settings.